Colgate Emery Process

Colgate Emery Process Colgate-Emery process, or modifications of it, is the most efficient and inexpensive method for large scale production of saturated fatty acids from fats and oils, and for the production of unsaturated fatty acids generally below IV levels of 120 (fish-derived) or 140 (soya, etc). The high temperature and pressure used permit short reaction time. In continuous, counter-current splitting the fatty oil is deaerated under a vacuum to prevent darkening by oxidation during processing. It is charged at a controlled rate to the bottom of the splitting tower through a sparge ring, which breaks the fat into droplets. The oil in the bottom contacting section rises because of its lower density and extracts the small amount of fatty material dissolved in the aqueous glycerine phase. At the same time deaerated, demineralized water is fed to the top contacting section, where it extracts the glycerine dissolved in the fatty phase. After leaving the contacting sections, the two streams enter the reaction zone. Here they are brought to reaction temperature by the direct injection of high pressure steam, and then the final phase of splitting occurs. The fatty acids are discharged from the top of the splitter to a evaporation chamber, where the entrained water is separated or flashed off. The glycerine-water solution is then discharged (to evap oration chamber. The sweet water is concentrate to 30% glycerine concentration before pre-treatment section) from the bottom of an automatic interface controller to a settling tank. Full counter-current flow of oil and water produces a high degree of splitting without the need of a catalyst. However, a catalyst may be used to increase reaction rate further. Method Colgate-Emery Process GREEN CHEMISTRY AND SUSTAINABILITY Principle 3: The substances used and produced are non-toxic Principle 5: No harmful solvent and auxiliary are used Principle 7: The raw material is renewable source which come from plant Principle 10: The products are all bio-degradable. Catalyst No catalyst Conversion Process temperature 250-260 Â °C Process pressure 5MPa Composition of final product 90% Fatty acids 10% Glycerine Process time needed 2-3 hour at 250 Â °C and 5MPa Hazardous Reactant/By product or product Glycerine May cause eye and skin irritation. Ingestion of large amounts may cause gastrointestinal irritation Inhalation of a mist of this material may cause respiratory tract irritation May cause headache Energy consumption Energy Intensive Type of reaction Endothermic Raw material cost Safety factor High pressure process No harmful chemical is used Flexibility of operation Unreacted vegetable oil is recycled to prevent waste of raw material. Variability of feedstock such as: corn oil, palm oil, palm kernel oil, etc Catalyst may be added to enhance the process Process Description The splitting tower is the most important part of this hydrolysis process. The Refined Bleached Deodorized Palm Oil (RBD PO) is preheated and feed into the column bottom by means of a sparge ring, around 1 m with a high-pressure pump. Water is introduced near the top at a ratio of 40-50% of the weight of the oil. The high splitting temperature (250-260 Â °C) ensures adequate dissolution of the water phase into the oil so that mechanical means for bringing the two phases into contact are not required. The oil rises through the hot glycerol-water collecting section at the bottom of the column and passes through the oil-water interface into the continuous phase, the oil layer in which hydrolysis takes place. Direct injection of high pressure steam at certain points quickly raises the temperature to 260 Â °C and enhances the splitting of oil. The continuous, countercurrent high pressure process splits fats in 98- 99% efficiency in only 2- 3 hours with little or no discoloration of the fatty acids and an efficient use of steam. The fatty acids are discharged from the top of the splitter to an evaporator, where the entrained water is separated or flashed off. The glycerine-water solution is then discharged from the bottom of an automatic interface controller to a settling tank. The vapour from evaporator is compressed, cooled and then collected at the feed water tank. After evaporator, the crude fatty acids are undergoing a series of distillation to separate different fatty acids according to their boiling point. Because of the inherent sensitivity of fatty acids toward heat, the distillation methods employed should be conducted at as low a temperature as practically and economically feasible while maintaining the shortest residence time of the fatty acid in the distillation unit. The separation sequence of fatty acids of palm oil is pre C-14, palmitic acid, mixture of oleic acid and linoleic acid, stearic acid and residue. The sweet water is let to settle down to separate into upper phase of unreacted fat and fatty acid and settle sweet water. It is settles for approximately 24 h at 80-90 Â °C and a pH of 4-5. Phosphoric acid is sometimes used to help break any emulsion, but this is not always required. The fats and fatty acids are decanted from the top of the sweet water and returned to the splitter feed for recycle. The settled sweet water is then sent to the evaporators for concentration. This alternative method requires two tanks, one for settling and one for collecting the sweet water. The tanks are alternated every 24 h to run continuously. The pre-treated sweet water will pass through 3 evaporators in series. This is accomplished by joining two or more evaporators in series using the heat from the live steam. The water vapour obtained from each evaporator is condensed to process water before being reused in the splitting column. Through these 3 evaporators in series, crude glycerine of about 88% can be obtained. The crude glycerine is then store in a tank. Reaction System Fat Splitting Column Refined Bleached Deodorised Palm Oil (RBD PO) is feed from the bottom of the column and the water is feed from the top of the column. The high temperature (250 Â °C) and high pressure (50MPa) enhance the solubility of water in oil phase where hydrolysis of oil occurs. The empty volume of the tower is used as the reaction compartment. The crude fat passes as a coherent phase from the bottom to the top through the tower, whereas the heavier splitting water travels downward as a dispersed phase through the mixture of fat and fatty acid. The mixture of fatty acid and entrained water is obtained at the top while the sweet water which contain 10 to 18% of glycerine. Approximately 2 hours of reaction time is needed to reach degrees of splitting up to 99%. Separation System Evaporator The fatty acids are discharged from the top of the splitting column to a evaporator, where the entrained water is separated or flashed off. The water content is removed to prevent oxidation and degradation fatty acids. The water vapour are then condensed and collected at the feed water tank. Distillation Column Due to the different carbon chain length and level of saturation of fatty acids, fatty acids can be separated according to their own boiling point. Due to the sensitivity of fatty acids toward heat, Distillation is carried out under high vacuum and lower temperatures and with the shortest residence time allowable. Typically, the distillation unit will work at a vacuum of 1.2kPa or less and temperature according to the feed composition and boiling point. After this series of distillation columns, 99% of palmitic acid, mixture of oleic acid and linoleic acid at 99% and 99 % stearic acid are achieved. The light cut or pre C14 fatty acids contain volatile impurities as well as odor and color bodies. The residue which consists of the higher boiling components, usually of lower quality can either be withdrawn separately or recycled directly for redistillation.

the threat of nuclear proliferation Essay -- essays research papers

One of the foremost growing concerns in the modern globalized world is the increasing rate of nuclear proliferation. Coupled with the burgeoning number of nuclear devices is the threat of a terrorist possibly obtaining a weapon of such magnitude. While one could argue that the rising number of states with nuclear capability is a disturbing prospect, particularly as many pursue such capabilities without the approval of the â€Å"traditional† nuclear powers, terrorists in possession of nuclear arms presents the most horrific outlook concerning nuclear proliferation. Terrorist groups, unlike states, are not organized governmental bodies, which complicates any means of formalized diplomacy or negotiation. Furthermore, unlike as compared to a state, one cannot formally declare war on a terrorist group, thus causing difficulties in regards to concerns of specific conflicts or targets. It is not as if one could penalize a terrorist group with economic sanctions or any other means st ates employ to deter threats from and intimidate one another. The globalized world has created a form of terrorism that knows no borders, and it would be very difficult to exert one’s will on a terrorist group, at least on a large scale. The coinciding fact that terrorists do not conduct warfare in the same manner as states do makes them increasingly unpredictable. A terrorist employment of a nuclear arm would not occur during an organized conflict; rather it would be used in a terrorist attack without warning. And due to the growing fervor of fundamental religious terrorism, there is a greater willingness among terrorists to sacrifice their own lives in pursuit of their goals. These combined elements create a frightening world in which today’s most astounding new threat possesses weapons of the most awesome power. The key to identifying the threat posed by a particular terrorist group is its basic tenets, and the level of violence thereof. â€Å"Groups that model themselves on an avenging angel or a vindictive god†¦are more likely to lash out than those whose core myth is the suffering Messiah,† (Stern, p.72). For example, the element that may be both the most prevalent and violent in the world today is fundamental Islamic extremism. With its emphasis on violent martyrdom and conquest on â€Å"infidels,† Islam is a religion based on values that are easily twisted to an extreme. Due to their religious ... ...ain such a weapon. Terrorists will not acquiesce to the terms concerning possession and production of nuclear weapons handed down by an international organization, regardless of its power. The best we can hope for is a level of regulation among the nuclear-capable states of the world that is strong enough to remove the possibility of any terrorist acquisition of nuclear materiel. The inherent lack of rationality in the mind of a terrorist is the quintessential factor behind the frightening prospect of nuclear proliferation among radicals, whether they are fundamental religious extremists, or political radicals. The globalized world of the 21st century has seen the threat of politically driven state ideology fade out and give way to the new threat of terrorist ideology. The dangers of such illogical principles are only compounded when on considers the nuclear element, and its significance in the hands of those who seek solely to harm others. The interconnectedness of the modern global community has compounded the threat of worldwide terrorism, and with greater nuclear proliferation, the potential for a devastating nuclear terrorist attack should shock and awe civilians everywhere.

History of nursing in nigeria and united states of america

According to Nursing and Midwifery Council of Nigeria (2005) , the detailed history of a profession that combines scientific principle , technical skills and personal comparison can't be precisely relayed but records hold that nursing came to limelight in 1854 when the mother of professional nursing , Florence Nightingale started the battlefield with other 38 nurses and cared for the sick and injured men during the Crimean war in England.Here persistence dedicated services, day nd night , experiences paid off by making her famous and recognized as a lady with lamp. Her metric service resulted to the beginning of professional com/5-rights-of-nursing-delegation/">nursing. Though, nursing in the early days was primarily a family matter with mothers caring for their own families or neighbors assisting each other.In 1880, the status of nursing was greatly improved and many women including religious order were now involved in patients care. During the era, there are many school of nursing for trained nurse throughout Europe with the first school established in 1836 by arker Theorder Fliedner in his parisn in Kavesworth Germany through the influence of Florence Nightingale the Kareworth school. In 1882, came the first movement for the recognition and registration of nurse.International body were formed Emirgare Royal Births Nurses Council of nurses established in 1893 and international council of nurse was established with headquarters in Geneva, Switzerland and branches all over the world. Also in 1926, the British college of nurses was founded. The first African American graduate nurse, Mary E. Mahoney, who promoted integration and etter working condition, for black patients and healthcare workers. Though nursing came to Nigerian through the British colonial master.They provided services and medical care for wounded soldiers at the forth with hospital later the first nursing home in Nigeria in Jericho, Ibadan by the government of the British colonial master Later on , missionaries and their wives came to supplement government effort by setting up mission homes, dispensaries etc and commence the training of nurses in Nigeria, though language barriers, there was no formal training but on the ob acquisitions skills and practical aspect are been rendered by nursing surgery The regional government in Nigeria began the training of nurses by setting individual regional standard in 1949, the school of nursing, Eleyele was established to facilitate the training of nurses, later in 1952 , the university college hospital Ibadan started the training of nurses in a higher standard. In 1949, the nursing council of Nigeria was established to complement the efforts to the various training bodies and creating standards for nurse. By 1965, department of nursing was established in the university of Ibadan to ommence a degree programme in Nigeria. Later on university of Ife in 1972 and university ot Nigeria Enugu also started degree in 1 , at present all t states in Nigeria has one or more school of nursing, midwifery and kind of post basic schools.More degree awarding institution has been granted the licencse to produce degree holder in nursing. Among them are Ahmadu Bello university, zairia. University of Calabar, Calabar, Ladoke Akintola University (LAUTECH) Ogbomoso. Also Private University, Babcok university, Disan Remo: Leadcity niversity, Madonna university among others started degree in nursing. Nurses, according to the ICN code of ethics as reviewed in 2005, have four fundamental responsibilities to promote health, to prevent illness, to restore health and to alleviate suffering. The need to nursing is universal inherent in nursing is respect for human rights, including cultural rights, the right to life and choice, to dignity and to be treated with respect.Nursing care is respectful and unrestricted by considerations of age, colour, creed, culture, disability or illness, gender, sexual rientation, nationality, polities, race or soc ial status. Nurses render health services to the individual, the family and the community and coordinate their services with those of related groups. Before 1981 , nursing was adjudged a vocation in Nigeria, but by virtue of the industrial arbitration panel (IAP ) award of 1981, nursing got the recognition of a full-fledge profession Arising from that pronouncement, the association has been working with the N ; MCN to take nursing to the highest pedestal of professionalism and one of the ways is through nursing education reforms.

Race For Nonviolent Drug Offenses Essay - 1110 Words

In 1619, the first enslaved person was brought to the colonies. A few years passed and in 1676, Bacon’s Rebellion occurred and racial identities were first introduced. Since that time there has been a social divide in North America and different parts of the world. In the beginning of the 1900s laws are put were put in place in the South and Midwest for drugs directed towards minorities. For the purposes of this essay I want to look at race when describing how race disproportionately plays in the legal system for nonviolent drug offenses. In America since 1970 since Nixon declared a war on drugs and the introduction of crack cocaine in the 80s America there has seen a rise of prison inmates. The majority of the inmates are minorities being charged with nonviolent drug offenses. As result, I would like to examine the annual rates of nonviolent drug convictions by race since 1980. In America we have been battling over issues about race for over 200 years. 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