14 results about "Glycolates" patented technology

The invention discloses a modified PGA degradable material and a preparation method thereof, and belongs to the technical field of polyglycolic acid (PGA) preparation. The preparation method comprises the following steps: carrying out an esterification reaction on a mixed solution containing raw materials, an auxiliary agent and a catalyst until the mixed solution is clear and transparent, and then carrying out a condensation polymerization reaction to obtain the modified PGA degradable material, the raw material is glycollic acid and / or glycollate; the auxiliary agent is a polybasic acid auxiliary agent and / or a polyhydric alcohol auxiliary agent. Through use of the binary acid and dihydric alcohol combined auxiliary agent, the effects of reducing the melting point of the PGA and widening the processing window of the PGA are achieved, so that the PGA is smoother in the processing and forming process.

The present application relates to the field of new material fine chemicals, and particularly relates to a low-cost preparation of a series of carbon four (C4) diacid (ester) by using coal chemical industry abundant oxalate and / or glycollic acid (ester) bulk raw materials, including butene diacid (ester), succinic acid (ester), tartaric acid (ester), and / or malic acid (ester) and the like, and the process features are that all of the coal chemical industry abundant carbon monoxide (synthesis gas), methanol, or formaldehyde and the like bulk C1 raw materials are used, and a series of C4 skeleton products are simply and efficiently prepared. The technology practices outstanding cost reduction and efficiency improvement results, and is beneficial to large-scale preparation of high-value chemicals relying on rich coal resources in China.

The invention discloses a high-temperature-resistant PGA degradable material and a preparation method thereof, and belongs to the technical field of preparation of high-temperature-resistant polyglycolic acid (PGA). The preparation method comprises the following steps: carrying out an esterification reaction I on a mixed solution containing raw materials and a catalyst until the mixed solution is clear and transparent, then adding a branching aid, and carrying out an esterification reaction II and a condensation polymerization reaction in sequence to obtain the high-temperature-resistant PGA degradable material, the raw material is glycollic acid and / or glycollate; the branched chain auxiliary agent contains a phosphorus branched chain auxiliary agent. According to the invention, the phosphorus-containing branched chain auxiliary agent is selected and used, so that the thermal decomposition temperature of the PGA is greatly increased, the PGA can obtain an excellent color value, the processing window of the PGA is widened, and the product quality is improved.

The invention relates to the field of chemical waste treatment, and discloses a degradation method of a glycolate oligomer. In the presence of a catalyst, a raw material containing a glycolate oligomer is contacted with low-carbon alcohol for reaction, and the catalyst comprises 10-60 wt% of CuO, 2-12 wt% of NiO and 28-88 wt% of SiO2. The degradation method provided by the invention is simple in process steps, under the action of the catalyst, fusel oil is fully utilized, degradation conversion of the glycolate oligomer is realized, complex by-products are not generated while glycolate is degraded, and the conversion rate of the ester oligomer is relatively high. According to the method provided by the invention, the production process is further simplified, and the operation cost is reduced.

The preparation method for the diester structure monomer includes the following steps: dissolving glycolate in a reaction solvent to prepare a glycolate solution; mixing the glycolate solution with triethylamine in a protective atmosphere, and cooling to form a mixture; and keeping the protective atmosphere unchanged, and adding the methacryloyl chloride to the mixture for esterification to generate a diester structure monomer. The diester structure monomer generated by the preparation method for the diester structure monomer has a long diester side chain and a group with a small volume and high acid sensitivity. As a result, a resin synthesized from the diester structure monomer has good adhesive force and film-forming property, high deprotection efficiency and plasticity, and the hardness and brittleness of the resin are improved. Moreover, the prepared diester acid protected structure monomer has the advantages of high yield, low by-product content and easy separation and purification.

A fragrance composition which reduces malodor during chemical treatment of keratin fibers is described. The keratin fibers may be human keratin fibers, such as human hair. The fragrance compound comprises p-mentha-8-thiol-3-one, cis-3-hexenol, cis-3-hexenyl acetate, and allyl amyl glycolate and further comprises one or more organic solvents selected from the group consisting of benzyl alcohol, dipropylene glycol, isopropyl myristate, and ethanol in an amount of 1% by weight or more, calculated to the total weight of the composition.

A biphasic composition comprising: I. an aqueous phase comprising: a. anionic surfactant having; j) a first anionic surfactant comprising an anionic saccharide-based surfactant or an anionic saccharide-based surfactant, and a C10-C20 lactylate, a C10-C20 glycolate or both and with the proviso that when the lactylate, glycolate or both and saccharide-based surfactants are present, the first anionic surfactant is at least 40% by weight anionic saccharride-based surfactant based on total weight of the first anionic surfactant; ii) a second anionic surfactant comprising a furan-based anionic sulphate free surfactant; which comprises: A) a head group comprising Ai) a furan ring Aii) a sulphonate group directly attached to the furan ring; wherein the furan-based anionic sulphate free surfactant has the structure of Formula (I): Formula (I) where R is a hydrophobic alkyl tail group having a carbon chain length of 8 to 18, 18:1 and 18:2 where R groups of different chain lengths can be used in combination as a blend, preferably a blend of chain lengths of C12 and C14 and X is a counterion, selected from organic and inorganic counterions; B) an amide containing linker group; and C) a hydrophobic alkyl tail group having a carbon chain length of 8 to 18; viii) amphoteric surfactant, zwitterionic surfactant or both; ix) 5 to 17%, and preferably, 7 to 16%, and most preferably, 7.5 to 15% (or from 8 to 15% or from 9 to 14.5% or from 9.5 to 13.5%) by weight of solvent comprising from 83 to 100% by weight C3 to C10 diol based on total weight of the solvent; x) optionally a thickener; and xi) 8 to 40%, and preferably, from 10 to 35%, and most preferably, from 11 to 32% (or 12 to 31% or 12 to 30% or 12 to 29%) by weight water; and xii) from 0.0 to 8% by weight of a C8 to C18, and preferably, C10 to C16, and most preferably, C12 to C14 fatty acid, fatty alcohol, fatty amide or mixture thereof; and II. an oil phase comprising: at least 92.5%, and preferably, 93 to 100% and most preferably, from 94 to 100% by weight oil or from 94 to 99% or from 95 to 98% by weight oil or 100% by weight oil that is clear at a temperature from -21°C to 35°C, and preferably, from -20°C to 35°C, and most preferably, from -18°C to 35°C or from -17°C to 35°C or from -17 to 30°C or from -16 to 28°C wherein the aqueous phase has a pH greater than 5.7 to 8, and the biphasic composition comprises at least 3.3 to 9.5% by weight of the first anionic surfactant, and from 7.5 to 18.5%, and preferably, from 7.7 to 18%, and most preferably, from 8 to 18% or from 8.2 to 18% or from 11 to 18% or from 12 to 18% or from 13 to 18% total surfactant based on total weight of the biphasic composition and further wherein the aqueous phase and the oil phase each, independently, make up from 30 to 70% by weight of the biphasic composition. The biphasic wash composition with agitation yields a transient emulsion which is a wash composition that delivers lather and moisturization benefits even when comprising at least 30% by weight oil.

The invention provides a method for preparing glycolate from cellulose, which comprises the following steps: swelling cellulose with an alkaline reagent or an ionic liquid, replacing a swelling solvent with an alcohol solvent, mixing the swelled cellulose, alcohol and an acid catalyst, placing the mixture in a closed reaction kettle for reaction, adding an oxidizing agent and a catalyst into the reactant, and reacting at the temperature of 60-80 DEG C to obtain the glycolate. Continuing to carry out closed reaction to prepare glycolate; the oxidizing agent is selected from at least one of tert-butyl hydroperoxide, benzoyl peroxide, hydrogen peroxide, nitrous acid and nitric acid. In the reaction process, direct use of high-pressure oxygen is avoided, the explosion risk is reduced, the reaction safety is improved, the glycollate yield is further improved in a non-oxygen environment, generation of by-products such as acetals is reduced, the cellulose is subjected to swelling and solvent replacement treatment firstly, the reaction difficulty is reduced to a certain extent, and the yield of the glycollate is improved. A more suitable bimetallic catalyst is matched, so that the catalytic effect is further improved.

The present invention discloses a method for preparing glycollate by electro-catalyzing ethylene glycol. The method for preparing glycollate by electro-catalytically ethylene glycol includes: assembling an anode catalyst, a cathode catalyst and an alkaline electrolyte containing the ethylene glycol into an electrolytic cell, and applying voltage for electrocatalytic reaction, where the ethylene glycol is oxidized at an anode to generate glycollate, and water is reduced at a cathode to generate hydrogen. The alkaline electrolyte containing the ethylene glycol can be obtained by dissolving waste plastic polyethylene terephthalate (PET) into an alkali liquid, and carrying out solid-liquid separation after hydrolysis reaction.

The application relates to a preparation method of terephthalate-glycolate monomers and a preparation method of degradable polyesters, wherein the preparation method of the terephthalate-glycolate monomers comprises the following steps: mixing esterification, a nitroxyl radical type catalyst, water and an organic solvent in a reaction device, then filling NO / NO2 mixed gas and oxygen-containing gas into the reaction device to perform an oxidation reaction, and after the reaction is completed, the terephthalate-glycolate monomer shown in formula (2) is obtained through cooling and separation. Through the synergistic catalysis of the nitroxyl radical type catalyst and the NO / NO2 mixed gas, the structural unit of glycolic acid can be effectively introduced into the polyester monomer, the method has high conversion rate, selectivity and stability, the process is safe and reliable; meanwhile, after the reaction is completed, the terephthalate-glycolate monomer is precipitated from the reaction solution in the cooling process, and is easy to purify and separate.

This invention relates to the preparation of an anode catalyst and a method for the highly selective electrocatalytic preparation of glycolates from ethylene glycol. The main challenge is addressing the low selectivity and insufficient conversion rates in current ethylene glycol electrocatalytic oxidation reactions. This invention employs a three-step method—hydrothermal-hydrogen annealing-impregnation—to prepare a Pd-NiCrO2 catalyst. The Pd-NiCrO2 catalyst exhibits strong activity, high selectivity, and good stability in the electrocatalytic oxidation of ethylene glycol, achieving a conversion rate of 100 mA / cm². 2 At the current density, the operating voltage is only 0.70 V; in addition, the chronocurrent stability of this anode catalyst can be maintained at more than 80% under different voltages, and the chronocurrent stability at 1.0 V can reach more than 91%.

The invention relates to chemical waste treatment, and discloses a method for catalytically degrading a glycolate oligomer, which comprises the following steps: in the presence of a catalyst, contacting a raw material containing the glycolate oligomer with low-carbon alcohol for reaction, wherein the content of the titanium oxide in the catalyst is 20-90 wt%, the content of the tin oxide in the catalyst is 2-55 wt%, and the content of the molybdenum oxide in the catalyst is 0.3-40 wt%. The method for catalytically degrading the glycolate oligomer is easy to operate, the glycolate oligomer can be continuously degraded, and the conversion rate of the glycolate oligomer and the recovery rate of methyl glycolate and ethylene glycol can be remarkably increased.

The present application belongs to the field of polymer preparation process, and relates to a device and method for preparing crude glycolide, which can be implemented in industry, operated continuously and run in large scale. The device comprises a dehydration unit, a polycondensation unit and a depolymerization unit connected in sequence. The dehydration unit comprises a dehydration kettle, a dehydration kettle heater, a dehydration tower and a dehydration tower condenser. The polycondensation unit comprises a polycondensation kettle and an optional pre-polycondensation kettle arranged upstream of the polycondensation kettle. The depolymerization unit comprises a pre-depolymerization kettle, a depolymerization kettle and a crude glycolide condenser. Ethanol acid or ethanol acid ester as raw material is finally obtained into crude glycolide product through dehydration separation, optional pre-polycondensation, polycondensation, pre-depolymerization and depolymerization. At the same time, a small amount of non-condensable gas, depolymerization residue, water or alcohol and other by-products are produced. The device can realize industrial large-scale and continuous production, and the yield of the target product is improved through various strengthening means.

A composition of liquid bis(alkyltin mercaptide) compounds containing 4-6 thio-ester groups of formula (I):         (R"S)aR'Sn(SR‴S)SnR'c(SR")d,     (I) where a, b, c and d are equal to 1 or 2, and a + b = c+ d = 3, R' is a linear, branched, or cyclic C1-C12 hydrocarbon group, SR" and R"S are independently selected from an alkyl thioglycolate group, an alkyl thiopropionate or a 2-mercaptoethyl carboxylate group, where the alkyl is a linear, branched, or cyclic C6-C18 hydrocarbon group; and SR‴S is an alkylene glycol di-thioester group, where the alkyl groups are linear or branched C1-C6 hydrocarbon groups.