摘要:
This invention relates to a process for the recovery of purified gamma-butyrolactone (BLO) in high yield from its crude reactor effluent containing BLO, tetrahydrofuran (THF), water, the acid-catalyzed hydrolysis product of BLO which is 4-hydroxybutyric acid (4-HBA), light and heavy organic acids, and alcohols. The process is particularly characterized by flash vaporizing a THF-free mixture of BLO, 4-HBA, water, light acids such as butyric acid and propionic acid, and alcohols so that the 4-HBA component is recyclized to form additional BLO. Heavy acids such as succinic acid and maleic acid are removed from the bottom.The total amount of BLO in the vapor stream then is fed to a distillation column where it is condensed; the water, including the water of dehydration, and light acid and alcohol impurities in the distillation are separated overhead from the BLO and removed. This procedure prevents BLO from further acid hydrolysis while the water of dehydration from 4-HBA is recovered.
摘要:
Vapor phase catalytic hydrogenation of maleic anhydride to gamma-butyrolactone is achieved in a conversion of 95% or more and a selectivity of 80% or more during a prolonged period of production. The process uses an activated catalyst prepared by reducing a catalyst composition comprising 30-65% by weight of CuO, 18-50% by weight of ZnO and 8-22% by weight of Al.sub.2 O.sub.3, and activating the reduced catalyst composition in hydrogen at an activation temperature of at least 400.degree. C., preferably 400.degree. to 525.degree. C., and optimally about 425.degree. C. The process suitably is carried out under predetermined and advantageous process conditions, including a defined molar ratio of hydrogen to maleic anhydride in the vapor reactant stream, a selected pressure during hydrogenation, a defined feed rate space velocity, a predetermined contact time, and a suitable reaction temperature.
摘要翻译:在长时间的生产过程中,将马来酸酐与γ-丁内酯的气相催化氢化达到95%以上的转化率和80%以上的选择性。 该方法使用通过还原包含30-65重量%的CuO,18-50重量%的ZnO和8-22重量%的Al 2 O 3的催化剂组合物制备的活化催化剂,并且在氢气中活化还原的催化剂组合物 活化温度至少为400℃,优选为400至525℃,最佳为约425℃。该方法适合在预定和有利的工艺条件下进行,包括规定的氢与马来酸酐的摩尔比 蒸汽反应物流,氢化期间的选定压力,限定的进料速率空速,预定的接触时间和合适的反应温度。
摘要:
A process for the production of PVP-H.sub.2 O.sub.2 products in the form of free-flowing powders is described in which a fluidized bed maintained at a reaction temperature of about room temperature to 60.degree. C. is contacted with finely divided droplets of a 30 to 85% by weight aqueous H.sub.2 O.sub.2 solution. Preferably the fluidized bed temperature is about 35.degree.-45.degree. C., a 50-70% H.sub.2 O.sub.2 solution is used, and the feed rate of introduction of the H.sub.2 O.sub.2 solution is about 5-50 g/minute/kg PVP present. The PVP-H.sub.2 O.sub.2 product preferably contains about 15-24%, preferably 18-22%, H.sub.2 O.sub.2 (1:1 molar ratio) and less than about 5% water.
摘要翻译:描述了以自由流动的粉末形式生产PVP-H 2 O 2产物的方法,其中保持在约室温至60℃的反应温度的流化床与30至85℃的细分散液滴接触 重量%H 2 O 2水溶液。 优选地,流化床温度为约35°-45℃,使用50-70%的H 2 O 2溶液,并且H 2 O 2溶液的进料速率为约5-50g /分钟/ kg存在的PVP。 PVP-H 2 O 2产物优选含有约15-24%,优选18-22%的H 2 O 2(1:1摩尔比)和小于约5%的水。
摘要:
This invention relates to a radiation curable crosslinkable composition containing (a) from about 0.1 to about 5 wt. % of an initiator containing at least 25% cationic initiator, (b) from about 0 to about 60 wt. % of a polymerizable vinyl ether, epoxide, vinyloxy alkyl urethane or acrylate and (c) from about 35 to about 99.9% wt. % of a polyfunctional alkenyl ether having the formulaA[(CH.sub.2 O).sub.m (Z).sub.r CH.dbd.CHR].sub.nwherein A is a carbon atom, --OCH.dbd.CHR or [C.sub.1 to C.sub.10 alkyl].sub.4-n ; R is C.sub.1 to C.sub.6 alkyl; Z is C.sub.2 to C.sub.8 alkyleneoxy; r has a value of from 0 to 6; m has a value of from 0 to 1 and at least one of r and m has a positive value; n has a value of from 1 to 4, with the proviso that m is 0 and n is one when A is --OCH.dbd.CHR, n has a value of 2 or 3 when A is [C.sub.1 to C.sub.10 alkyl].sub.4-n and n has a value of 4 when A is carbon. The invention also relates to the process of curing said composition and to a cured film on a substrate coated with the above composition.
摘要:
The invention relates to the preparation of N-vinyl lactams having the formula ##STR1## wherein n is an integer having an value of from 1 to 3 in a one-stage, non-aqueous process which comprises reacting a lactam having the formula ##STR2## with acetylene under an acetylene partial pressure of from about 25 to about 125 psig. in the presence of an inert gas diluent and a catalyst having the formula ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are all lower alkyl or alyl or one of R.sub.1, R.sub.2 and R.sub.3 can also be hydrogen and M is a metal selected from the group of cesium, potassium, sodium and lithium.
摘要:
This invention relates to an improved process for reacting butyrolactone and ammonia which comprises conducting the reaction in the vapor phase in the presence of a magnesium silicate catalyst to selectively produce 2-pyrrolidone in higher yield and purity.
摘要:
This invention provides a process for producing 1,4-butanediol by (1) selectively hydrogenating acrolein to a product mixture of allyl alcohol and residual acrolein in a 2:1 ratio, (2) converting the product mixture to acrolein diallyl acetal under acidic conditions, (3) selectively hydroformylating the acrolein diallyl acetal to a trialdehyde, and (4) reacting the trialdehyde under substantially neutral hydrolysis/hydrogenation conditions to yield 1,4-butanediol.Acrolein is converted into tetrahydrofuran employing the process conditions described above, except that the step (4) hydrolysis/hydrogenation reaction is conducted under acidic conditions.
摘要:
This invention provides a process for producing 1,4-butanediol by (1) selectively hydrogenating acrolein to a product mixture of allyl alcohol and residual acrolein in a 2:1 ratio, (2) converting the product mixture to acrolein diallyl acetal under acidic conditions, (3) selectively hydroformylating the acrolein diallyl acetal to a trialdehyde, and (4) reacting the trialdehyde under substantially neutral hydrolysis/hydrogenation conditions to yield 1,4-butanediol.Acrolein is converted into tetrahydrofuran employing the process conditions described above, except that the step (4) hydrolysis/hydrogenation reaction is conducted under acidic conditions.
摘要:
The present invention provides a process for preparing a co-catalyst composition of increased abrasion resistance for use in reactions which involve reaction conditions of high stress, e.g., vapor phase oxidations. The process comprises intimately mixing an aqueous suspension of colloidal silica particles with a water-soluble metal salt which is decomposable by heat to a metal oxide, calcining the mixture, adding a further amount of the aqueous suspension of colloidal silica particles, and drying this co-catalyst composition.