摘要:
Process for producing epichlorohydrin comprising subjecting to a dehydrochlorination operation, dichloropropanol produced from glycerol comprising aldehydes.
摘要:
Aromatic polyimide composition and articles manufactured therefrom. This invention relates to an aromatic polyimide molding composition, comprising at least one aromatic polyimide (A) chosen from the group consisting of aromatic polyamide-imide, aromatic polyesterimides and aromatic polyimide free of any ester and amide group of specific type and typically from 0.5 to 30% wt of at least one fluoroelastomer (B), with respect to the total weight of (A) and (B), to a method for manufacturing the same, to a molding process of the same, and to the articles manufactured therefrom. Preferably, the component (A) of the composition is at least one aromatic polyamide-imide manufactured by a process including the polycondensation reaction between (i) at least one acid monomer chosen from trimellitic anhydride and trimellitic anhydride monoacid halides and (ii) at least one commoner chosen from the group consisting of 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylether, m-phenylenediamine and mixtures therefrom. Advantageously, the aromatic polyimide composition of the invention, owed to its improved flexibility during the molding process, is suitable for the manufacture of articles from mold of complex geometries, such as undercuts, without permanently deforming or cracking upon ejection from the mold.
摘要:
Process for preparing a chlorohydrin, comprising the following steps: (a) a polyhydroxylated aliphatic hydrocarbon, an ester of a polyhydroxylated aliphatic hydrocarbon or a mixture thereof is reacted with a chlorinating agent and an organic acid so as to give a mixture containing the chlorohydrin and esters of the chlorohydrin (b) at least part of the mixture obtained in step (a) is subjected to one or more treatments in steps subsequent to step (a) (c) polyhydroxylated aliphatic hydrocarbon is added to at least one of the steps subsequent to step (a), so as to react, at a temperature greater than or equal to 20° C., with the esters of the chlorohydrin, so as to form, at least partly, esters of the polyhydroxylated aliphatic hydrocarbon.
摘要:
Process for preparing a chlorohydrin, wherein a polyhydroxylated aliphatic hydrocarbon, an ester of a polyhydroxylated aliphatic hydrocarbon or a mixture thereof is subjected to reaction with a chlorinating agent in the presence of a liquid phase comprising heavy compounds other than the polyhydroxylated aliphatic hydrocarbon and having a boiling temperature under a pressure of 1 bar absolute which is at least 15° C. greater than the boiling temperature of the chlorohydrin under a pressure of 1 bar absolute.
摘要:
Monolayer ion-exchange membrane structured in the thickness comprising ion-exchange sites covalently bonded to a support polymer, the membrane comprising two surface zones located on either side of a mid-zone, each surface zone having a thickness of not more than 15% of the total thickness of the membrane, in which the surface zones have a mean ion-exchange site density Dsurface calculated on the thickness of the surface zones of at least Dtotal.
摘要:
Process for the manufacture of 1,2-dichloroethane (DCE) starting from a stream of ethane which is subjected to a catalytic oxydehydrogenation (ODH) thus producing a gas mixture containing ethylene which is then dried and conveyed to a chlorination reactor supplied with a flow of chlorine so that at least 10% of the ethylene is converted to DCE. The stream of products derived from the chlorination reactor is then conveyed to an oxychlorination reactor in which the majority of the balance of ethylene is converted to DCE.
摘要:
A process for preparing a halogenated polymer in a medium comprising liquid or supercritical carbon dioxide, comprising a step involving the radical polymerization of at least one halogenated monomer and at least one step involving cross-flow filtration; and a cross-flow filtration device.
摘要:
Process for manufacturing an oxirane by reaction between an olefin and hydrogen peroxide in the presence of a catalyst and an organic diluent, according to which the hydrogen peroxide is an aqueous hydrogen peroxide solution obtained by extraction, with substantially pure water, of the mixture derived from the oxidation of at least one alkylanthrahydroquinone, without subsequent washing and/or purification treatment.
摘要:
A process for manufacturing a cyclic peptide which comprises providing a cyclic peptide bonded to a Merrifield-type resin and cleaving the cyclic peptide from the Merrifield type resin by transesterification.
摘要:
Alkaline earth metal carbonate exhibiting a resistance to acids expressed as pH of less than 7 measured after suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g/L of citric acid monohydrate, 2.57 g/L of NaCl and 0.068 mol/L of NaOH, after 35 minutes of stirring at 25° C. and at 1 000 rpm, or expressed as a moisture pick-up lower than or equal to 2 g water/kg of calcium carbonate after one week of storage at 22° C. and 50% relative humidity, or as a Differential Scanning Calorimetry (DSC) spectrum showing at least one peak between 170 and 190° C. when measured at a heating rate of 10° C./min under nitrogen atmosphere from 25 to 250° C. in open cells. Process for the preparation of said particles, compositions containing said particles and the use thereof.
摘要翻译:表现出耐酸性的碱土金属碳酸盐,其表现为pH小于7,将1.0g颗粒悬浮在由20ml甲苯和80ml由去离子水组成的水相中,11.76g / L 柠檬酸一水合物,2.57g / L NaCl和0.068mol / L NaOH,在25℃和1000rpm下搅拌35分钟后,或表现为低于或等于2g水的吸湿 / kg碳酸钙,在22℃和50%相对湿度下储存一周后,或作为差示扫描量热法(DSC)光谱,显示在170和190℃之间的至少一个峰值。当以加热速率 10℃/ min,在氮气氛下,25〜250℃,在开孔中。 所述颗粒的制备方法,含有所述颗粒的组合物及其用途。