摘要:
The present invention relates to a process for dehydrochlorinating polyvinylchloride polymers to remove about 30 wt % chlorine therefrom by heating the starting materials PVC and deoxygenated liquid water, preferably neutral liquid water at temperatures from about 200.degree. C. up to the critical temperature of water at autogenous pressure to maintain the water as a liquid phase. The process has utility in recycling by enabling PVC to be dechlorinated specifically by a means that does not release chlorine gas.
摘要:
The present invention relates to a process for depolymerizing polyacrylonitrile into water soluble by-products, including ammonia and lower molecular weight carbonaceous materials by contacting the starting materials, polyacrylonitrile, and neutral, hot liquid water at a temperature from about 200.degree. C. up to the critical temperature of water at autogenous pressure. The present invention has utility as a means for degrading polyacrylonitrile without producing toxic hydrogen cyanide as a by-product.
摘要:
The present invention relates to enhanced process for converting certain ethers, such as sec-butyl ether and isopropyl ether to their corresponding reaction products in the presence of water. This may be accomplished by adding a rate enhancing surfactant, such as an anionic or cationic surfactant to a mixture of the ether and water, preferably least about 10.sup.-5 molar surfactant. Under those conditions the reaction shows an increase in reaction rate over the rate of the process wherein surfactant is not used.
摘要:
The present invention relates to a process for depolymerizing and dehalogenating rubber materials by heating the rubber materials with neutral liquid water at temperatures from about 200.degree. C. up to the critical temperature of water at autogenous pressure. The process has utility in degrading rubber materials, and further does not release hydrogen halogen into a gas phase.
摘要:
The invention concerns a method for reactive separation of mixtures containing hydrocarbons and oxygenated hydrocarbons, by contacting a mixture of hydrocarbons such as C.sub.2 to C.sub.26 hydrocarbons and mixtures thereof and oxygenated hydrocarbons, such as C.sub.2 to C.sub.40 oxygenated hydrocarbons and mixtures thereof to form a mixture of hydrocarbons and lower molecular weight oxygenated hydrocarbons and heating the mixture in water at temperature typically from about and pressure sufficient to cleave the oxygenated hydrocarbons to lower molecular weight products to form a liquid layer containing water soluble reaction products and an organic layer containing primarily hydrocarbons.
摘要:
The present invention provides for a simplified process for converting ethers into their corresponding alcohols comprising forming an aqueous mixture of the ether and at least about 50% by weight water and heating the mixture under autogeneous pressure at a temperature of from about 250.degree. to 450.degree. C., more preferably from about 250.degree. C. up to the critical temperature of water which is about 374.degree. C. Heating is continued for a period of time sufficient to convert at least about 20% by weight of the ether, usually from about 5 up to about 120 minutes, depending on temperature and the amount of water present, and the identity of the starting ether feedstock.The process may be characterized as an aquathermolysis reaction wherein the reaction proceeds in water primarily through ionic routes rather than through free radical routes. Accordingly, relatively high conversion rates and good yields of alcohol and other reaction by-products may be obtained without the necessity of using a catalyst in the process.
摘要:
Promoter amines are used to enhance CO2 uptake by sterically hindered or tertiary amines. The promoter amines can be cyclic amines, including aromatic cyclic amines or bridged cyclic amines. The combination of a promoter amine plus a sterically hindered or tertiary amines allows for improved uptake kinetics while reducing or minimizing the amount of formation of carbamate salts. The promoted sterically hindered or tertiary amines can be used as part of a CO2 capture and release system that involves a phase transition from a solution of amine-CO2 products to a slurry of amine-CO2 precipitate solids.
摘要:
A liquid aminoether acid gas absorbent which is subject to freezing in a cold climatic zone though which the aminoether is to be shipped is rendered freeze-resistant by mixing the aminoether with water prior to transport through the cold climatic zone; the aminoether/water mixture typically contains 10 to 40 weight percent water, based on the weight of the aminoether. The aminoether/water mixture can also be stored in the cold climatic zone without being externally maintained at a temperature above the inherent freezing point of the aminoether.
摘要:
Ionic liquids are capable of acting as solvents for amine CO2 absorbent compounds in CO2 separation processes and when so used enhance the sorption of the CO2 by the amine. A cyclic sorption process for separating CO2 from a gas stream, such as flue gas or natural gas, brings the gas stream into contact with an absorbent solution of an amine CO2 sorbent in an ionic liquid solvent followed by desorbing the CO2 to regenerate the amine.
摘要:
Aminoethers are used as corrosion inhibitors in boiler systems in which a working fluid comprising water with an aminoether corrosion inhibitor is circulated from a heater to a utilization site at which the working fluid gives up energy and decreases in temperature. A preferred class of aminoethers are the alkoxytriethyleneglycol-tert-alkylamines such as methoxy triethyleneglycol-tert-butylamine