摘要:
This invention relates to an improved process for preparing cellulose derivatives by alkalizing cellulose to form alkali cellulose, alkylating the alkali cellulose to form alkylated alkali cellulose, and recovering the alkylated alkali cellulose. According to the process of the invention, finely-divided, preferably powdered, cellulose is reacted with an aqueous-alcoholic alkali metal hydroxide solution at a temperature of from about 20.degree. to 120.degree. C., to form alkali cellulose, oxygen is removed, and the water content is reduced to from about 2.5 to 6.0 moles per anhydroglucose unit, prior to alkylization.
摘要:
A process and an apparatus for the continuous ozonization of unsaturated organic compounds in the presence of water, wherein(a) the fresh charge mixture of unsaturated compounds to be ozonized is reacted in at least one first reactor in parallel flow with ozonic gas, which was previously used for ozonizing a previously partially ozonized charge mixture, and(b) simultaneously a previously partially ozonized charge mixture is reacted in at least one second reactor in parallel flow with fresh ozonic gas,and wherein, optionally, said at least two reactors contain at least two mixing sections for mixing the charged liquid and gaseous phases with each other where the hydraulic diameter of the mixing elements in the individual mixing section is reduced in the flow direction.
摘要:
A process for the production of free-flowing detergent granules or partial granules comprising the steps of:(a) providing an interiorly baffled, rotatable drying apparatus capable of rotating at high speeds;(b) introducing water-containing alkyl or alkenyl oligoglycoside pastes into the rotatable, drying apparatus;(c) introducing into the drying apparatus detergent components selected from the group consisting of anionic surfactants, nonionic surfactants, detergent builders, and mixtures thereof; and(d) simultaneously drying and granulating the water-containing alkyl or alkenyl oligolycoside pastes and detergent components.
摘要:
A process for the transformation of glycerol into 1,3-propanediol by microorganisms comprising fermenting the microorganisms in media having a glycerol content of from about 5% to about 20% by weight under standard anaerobic fermentation conditions and recovering the 1,3-propanediol. The microorganisms according to the invention do not suffer catabolic repression by the large amount of 1,3-propanediol produced by the process.
摘要:
Solid fabric-care preparations showing a tendency towards troublesome interactions, or constituents thereof, are coated by application of dissolved or dispersed organic film-forming polymers soluble in alkaline medium. Suitable polymers contain in particular carboxyl groups and are preferably derived from vinyl esters. The carboxyl groups emanate from copolymerized carboxylic acids which make up from about 2 to 10 mole % of the copolymer. The copolymers are best prepared in the form of finely divided dispersions and optionally contain a protective colloid and/or an emulsifier.
摘要:
A washing additive consisting of a bag, filled with a detergent composition, of a polyvinyl-alcohol-based film readily soluble in borate-containing aqueous solutions. The detergent composition is a mixture of a nonionic surfactant, a quaternary ammonium compound containing a long-chain radical, which may be completely or partly replaced by a fatty amine ethoxylate or by a .beta.-aminoalkyl propionic acid derivative, an activator for per compound, an antigel agent, and a viscosity regulator, wherein the mixture has a viscosity of from 1000 to 100,000 mPas for a shear gradient of from 5 to 500 s.sup.-1.
摘要:
The present invention is for a process for the preparation of alkali metal salts of acyl cyanamides, especially those of aliphatic carboxylic acids by reacting carboxylic acid esters of lower alcohols with monoalkali metal cyanamides. The reaction results in a process which is simple and efficient and one which can be used in commercial scale batch or continuous operations.
摘要:
This invention relates to a process for concentrating aqueous solutions having temperature-sensitive components. More particularly, this invention relates to an improved process for concentrating aqueous solutions having temperature-sensitive components which comprises the steps of:(a) subjecting the aqueous solution to an ultrafiltration procedure to provide a permeate solution and a residual solution; and(b) subjecting the permeate solution from step (a) to freezing and removing ice crystals formed thereby.
摘要:
A process for the reduction of the particle size of coarse grain, crystalline zeolitic sodium aluminosilicate of the NaA type obtained in an aqueous alkaline suspension by crystallization of a reaction mixture suspension formed from sodium aluminate solution and sodium silicate solution, said sodium aluminosilicate having a large cation exchange capacity consisting essentially of subjecting said aqueous alkaline suspension of the crystallized sodium aluminosilicate to treatment on a vibrating screen having a substantially uniform mesh size between 25 to 100 .mu.m, the number of vibrations per minute and the amplitude of oscillation of said screen being so selected that at least 99.95 percent by weight, based on the anhydrous weight, of sodium aluminosilicate particles recovered have a particle size of less than 100 .mu.m, the said aqueous alkaline suspension of the crystallized sodium aluminosilicate having a molar ratio of 2.5-5 Na.sub.2 O:1 Al.sub.2 O.sub.3 :1.8 to 2 SiO.sub.2 :50-100 H.sub.2 O.
摘要翻译:一种通过结晶由铝酸钠溶液和硅酸钠溶液形成的反应混合物悬浮液,在碱性水溶液中获得的NaA型结晶沸石钠铝硅酸盐的粒度降低的方法,所述铝硅酸钠具有大的 阳离子交换能力主要包括使结晶的硅铝酸钠的水性碱性悬浮液在具有25至100μm之间的基本上均匀的筛网尺寸的振动筛上进行处理,每分钟的振动次数和所述筛网的振荡幅度为 选择至少99.95重量%,基于无水重量,回收的硅铝酸钠颗粒的粒度小于100微米,所述结晶的硅铝酸钠水溶液的碱性悬浮液的摩尔比为2.5-5 Na 2 O:1 Al 2 O 3:1.8〜2SiO 2:50〜100H 2 O。
摘要:
Porous granules of active yeast are produced by mixing moist yeast having a solids content of 30% to 40% with a gas in an amount of 0.2 to 2.0 times the volume of the yeast, extruding the resultant mixture at a pressure of from 1 to 10 atmospheres through orifices having a length to diameter ratio of about 1:1 to 4:1 and allowing escape of gas from the interior of the resultant extrudate to form pores communicating with the surface to produce porous granules of active yeast. The granules may be dried to produce active dry yeast granules having a total surface area formed by the outside surface plus the interior surface of the granules of at least 1.5 times the total area of the outside surface of the granules. The active dry yeast granules have good vitality and are capable of rapid rehydration and regeneration.