15987 results about "Isopropylene glycol" patented technology

Methods for hydrogenolysis are described which use a Re-containing multimetallic catalyst for hydrogenolysis of both C—O and C—C bonds. Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 6-carbon sugar, sugar alcohol, or glycerol are described. It has been surprisingly discovered that reaction with hydrogen over a Re-containing multimetallic catalyst resulted in superior conversion and selectivity to desired products such as propylene glycol.

Disclosed is a process for the removal of impurities, especially color forming impurities, from 1,3-propanediol.

A reactive-separation process converts glycerin into lower alcohols, having boiling points less than 200° C., at high yields. Conversion of natural glycerin to propylene glycol through an acetol intermediate is achieved at temperatures from 150° to 250° C. at a pressure ranging from 1 and 25 bar. The preferred applications of the propylene glycol are as an antifreeze, deicing compound, or anti-icing compound. The preferred catalyst for this process in a copper-chromium powder.

The invention is a continuous process for the preparation of polytrimethylene ether glycol from 1,3-propanediol reactant. In addition, the invention is directed to a continuous multi-stage process comprising reacting at least one reactant in a liquid phase in an up-flow column reactor, and forming a gas or vapor phase by-product wherein the gas or vapor phase by-product is continuously removed at the top and at least one intermediate stage.

A stripping composition and a method of using the stripping composition to remove cured resins such as elastomeric silicone adhesive deposits from ceramic and metal surfaces of electronic modules to provide reworkability options in assembly processes including diagnostic parts, parts replacement and recovery of substrates from test vehicles is provided. The stripping compositions comprise a base preferably an organic base such as a quaternary ammonium hydroxide, a surfactant and a high boiling environmentally and chemically safe solvent such as di- or tri-propylene glycol alkyl ether. In another stripping composition, the base is used in combination with a mixture of N-alkyl pyrrolidone components, preferably an N-alkyl pyrrolidone and a N-cycloalkyl pyrrolidone. The stripping compositions are used to contact an electronic module having a cured resin such as a silicone adhesive residue deposit on the module surface to dissolve, remove or strip the deposit.

Dental bleaching compositions that include sucralose. The bleaching agent is dispersed within a carrier, which is optimally sticky and viscous such as a mixture of propylene glycol and silica fume. Anhydrous propylene glycol and/or anhydrous glycerin are especially useful in order to maintain the desired degree of hydration of the perborate being used. Flavorants may be added to enhance the taste of the dental compositions, since they will be used within a person's mouth. For best results, a flexible, thin-walled, comfortable-fitting, custom dental tray is used with the dental bleaching compositions. The dental compositions are sufficiently sticky and viscous so as to adhere and retain a dental tray against a person's teeth which is designed so as to not exert significant mechanical pressure onto the person's teeth.

The present invention provides an improved process for the hydrogenation of 3-hydroxypropanal to 1,3-propanediol which comprises purifying an aqueous solution of 3-hydroxypropanal by contacting said aqueous solution with a purifying agent prior to hydrogenation.

The invention discloses light-fragrance electronic cigarette atomized smoke solution and a preparation method thereof. The atomized smoke solution comprises the following components in percentage by weight: 30-45 percent of propylene glycol, 20-35 percent of glycerol, 5-15 percent of deionized water, 5-15 percent of alcohol, 15-45 percent of traditional Chinese medicine liquid, 2-5 percent of tobacco flavor, 2-6 percent of tobacco extract and 0.1-2 percent of forming agent, wherein the traditional Chinese medicine liquid is extraction liquid which is obtained by extracting traditional Chinese medicine mixture through water distillation or alcohol extraction, and the traditional Chinese medicine mixture consists of tendrilleaf fritillary bulb, mint leaf, loquat leaf, dendranthema indicum, violet, sweet-scented osmanthus and green tea. The light-fragrance electronic cigarette atomized smoke solution not only can meet the smoking demands of smokers, but also can effectively reduce irritation of smoke to tracheas, bronchi, throats and lungs of bodies, and has the efficacies of clearing heat, moistening lungs, arresting coughs, expelling phlegm, refreshing and restoring consciousness, regulating qi-flowing, resolving stagnation and the like.