12results about "Sulfuric acid esters preparation" patented technology

The application belongs to the technical field of sewage treatment, and particularly relates to a sterilization cleaning agent for treating oilfield produced water by a double membrane method and a synthesis method thereof. The synthesis method comprises the following steps: under the action of a catalyst, epoxypropane is embedded into polyoxypropylene ether in 2,6-bis{[bis(2-pyridylmethyl)amino]methyl}-4-methylphenol in a DMF solvent to obtain an intermediate under high-temperature and sealed space conditions; and then dimethyl sulfate is used for quaternary ammonium reaction on a pyridine group of the intermediate and alkyl end-capping reaction on a polyether group to obtain a product sterilization cleaning agent. The sterilization cleaning agent has the effects of sterilization and chemical cleaning in one, and has the characteristics of good cleaning effect and strong sterilization capacity.

The application belongs to the technical field of hydrogen sulfide and peroxynitrite ion detection, and specifically discloses a near-infrared fluorescent probe DCI-TSO based on an ICT mechanism, a preparation method and application, and comprises the following steps: S1, synthesizing compound 1; S2, synthesizing compound 2; S3, synthesizing compound 3: dissolving compound 1 obtained in S1 and compound 2 obtained in S2, and adding dropwise 1,8-diazabicyclo[5.4.0]-7-undecene reaction; S4, synthesizing compound 4; S5, synthesizing probe DCI-TSO: dissolving compound 3 obtained in S3 and compound 4 obtained in S4, and adding dropwise sodium methoxide under stirring reaction at room temperature in a protective atmosphere. The application adopts the above-mentioned near-infrared fluorescent probe DCI-TSO based on an ICT mechanism, a preparation method and application, and can detect H2S and ONOO ‑ with good optical properties and biocompatibility, and has great commercial value.

A process comprises continuously adding a first stream and a second stream to a sulfonation vessel, wherein the first stream comprises aminoethanol sulfate ester (AES) and the second stream comprises an aqueous solution of sodium sulfite (Na2SO3). The process comprises continuously mixing the AES and the aqueous solution of Na2SO3 in the sulfonation vessel, thus producing a mixture. The process comprises continuously subjecting the mixture to heat in the presence of an inert gas, thus converting the AES to the taurine via sulfonation. In an aspect, the AES has a residence time of no more than four hours in the sulfonation vessel. In an aspect the heating step is conducted at a temperature of at least 115° C. and a pressure of at least 200 psi.

The application discloses a synthesis process of cysteamine hydrochloride, which comprises the following steps: (1) cooling ethanolamine under an ice water bath, then adding concentrated sulfuric acid drop by drop, maintaining low temperature, heating and distilling to obtain 2-aminoethyl sulfate; (2) spraying sodium hydroxide solution to 2-aminoethyl sulfate under an ice water bath, then adding sodium hydroxide solution to dissolve, adding carbon disulfide drop by drop, stirring at room temperature after drop completion, heating and reacting, washing with water to obtain 2-mercaptothiazoline; (3) mixing 2-mercaptothiazoline with hydrochloric acid solution, pressurizing, heating and refluxing to react, adding hydrochloric acid solution drop by drop in the reaction, stirring and cooling, distilling to obtain crude cysteamine hydrochloride; and (4) sequentially cleaning the crude cysteamine hydrochloride with an ethanol aqueous solution and a hydrochloric acid solution, and drying to obtain refined cysteamine hydrochloride. The synthesis process of the cysteamine hydrochloride can improve the yield and purity of the target product, and meets the requirements of a pharmaceutical intermediate.

The application relates to the technical field of petroleum chemical industry, and provides a surfactant, a preparation method thereof and application of the surfactant in oil displacement. The structural formula of the surfactant provided by the application is shown as formula I. Compared with traditional double alkyl double quaternary ammonium salt cationic surfactants, the surfactant provided by the application has sulfonic acid groups at two ends, the molecular structure of the sulfonic acid group amphiphilic hydrophilic group endows the surfactant with better temperature resistance and salt resistance and better water solubility, an oil displacement system formed by the surfactant can reduce the crude oil / formation water interfacial tension to ultra-low under an alkali-free condition; and the oil displacement system has strong oil displacement capacity at a low concentration, is resistant to high formation temperature, and performs excellently in a heavy oil and high salinity environment.

The application provides a 2-aminoethyl hydrogen sulfate synthesis method, first, ethanolamine and centrifugal mother liquor are mixed in a mixer by a transfusion pump according to a certain proportion, then the mixture is introduced into a first-stage tubular reactor to react, then the reaction solution is mixed with sulfuric acid, after the mixing, the mixture is introduced into a second-stage tubular reactor to react, after the reaction is completed, the reaction solution is cooled and crystallized, and 2-aminoethyl hydrogen sulfate is obtained by centrifugal drying. The application has the advantages that the solubility of 2-aminoethyl hydrogen sulfate in the reaction solution is significantly improved, the situation that a large amount of solid is precipitated in the reaction process is effectively avoided, the high reaction conversion rate is ensured, the conditions for the optimization of the crystallization process are provided, and the problems of the solid content fluctuation and the unstable crystallization state caused by the dehydration control are fundamentally solved.

The application provides a preparation method of anti-caking 2-aminoethanol hydrogen sulfate spherulites. By optimizing the preparation of a seed slurry, a dehydration rate, a reaction endpoint temperature, and the subsequent cooling process, the crystallization growth process of 2-aminoethanol hydrogen sulfate is controlled, and the 2-aminoethanol hydrogen sulfate with an average particle size greater than 600 mu m is prepared through drying, so that the product has high yield and high purity.

This utility model relates to the field of acetone cyanohydrin amidation technology, specifically to a mixing reactor for acetone cyanohydrin amidation. The mixing reactor has a horizontal structure, with a mixture inlet, a reactant outlet, and at least one acetone cyanohydrin inlet on the shell. An inner tube connecting the mixture inlet is provided inside the shell, and at least one nozzle is provided on the inner tube. The acetone cyanohydrin inlet is an inner-extended structure and corresponds to the nozzle. The inner tube consists of a vertical section and a horizontal section, with the vertical section located at the end or midpoint of the horizontal section. This mixing reactor maximizes the uniform mixing of materials, improving the utilization rate of the reactor and the raw materials.

The application discloses a fiber water-based dispersion system and a preparation method and application thereof. The dispersion agent for fracturing fluid provided by the application has a general formula shown in formula I. The application provides a preparation method of the dispersion agent, which comprises the following steps: after amino acid is protected by amino and carboxyl, a sulfonic acidization reaction is performed, and deprotection is performed to obtain sulfonated amino acid. The application uses a small-molecule natural amino acid with good biodegradability and low environmental toxicity as a dispersion agent, and uses a composite reagent of sulfur trioxide and an organic base to introduce a sulfonic acid group to the side chain of the amino acid in a mild, controllable and low-toxicity manner, so that good dispersibility of fibers in a hydraulic fracturing process is achieved. Meanwhile, the space steric hindrance of the natural amino acid enables the water-based dispersion system to use a smaller amount of a polymer as a stabilizer compared with a traditional system.

The need for a liquid hand dishwashing composition which comprises surfactant which is derived from more renewable sources, while still providing good performance, especially suds-mileage in the presence of greasy-particulate soils and hard water, and grease cleaning, is met by formulating the liquid hand dishwashing composition using an alkyl alkanolamide sulfate anionic surfactant in combination with an alkyl sulfate anionic surfactant.

The present application provides a kind of low bulk density aminoethyl hydrogen sulfate synthesis method with operation and crystallization control as core: by the intermediate product formed in the reaction process of ethanolamine and sulfuric acid is carried out staged vacuum dehydration, and in the dehydration crystallization process, crystal growth regulation measures are introduced, the controllable crystallization of product is realized, so that the bulk density of product is significantly reduced, effectively avoid its hardening and caking in the process of storage and transportation.The process of the present application realizes that the bulk density is less than or equal to 0.50 g / cm3, preferably 0.35-0.45 g / cm3, significantly improves the efficiency of solid-liquid separation and drying, and improves the subsequent ethyleneimine continuous cyclization yield and stability.