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126results about How to "High yield and purity" patented technology

Process for preparing high-pure 4-hydroxybenzophenone

The invention relates to a process for preparing high-pure 4-hydroxybenzophenone, which belongs to the field of organic chemical synthesis. The process includes steps of adding and stirring chlorobenzene and aluminium choride in a reactor, dripping mixing fluid of phenol and chlorobenzene when at a temperature of 10DEG C-50 DEG C, stirring for 30 min again after dripping, dripping benzoyl, raising temperature slowly, reacting for 2h when at a temperature of 40DEG C-45DEG C, reacting for 1h when at a temperature of 60DEG C-70DEG C, slowing adding reaction fluid into cold water, stirring for 2hwhen at the temperature of 20-30DEG C, centrifuging, washing solid via water until being neutral, drying to obtain crude 4-hydroxybenzophenone, utilizing toluene with quantity double of that of the crude 4-hydroxybenzophenone to recrystallize to obtain white 4-hydroxybenzophenone, washing an oil layer via water until being neutral, distilling anhydrous calcium chloride after drying and then recycling chlorobenzene. Mole ratio of phenol and benzoyl chloride is 1: (1-1.5), mole ratio of phenol and aluminium choride is 1: (1-2), and mass ratio of phenol and chlorobenzene is 1: (1-5). The processutilizes the chlorobenzene as a reaction solvent, greatly increases purity and yield of products, and greatly reduces usage of the solvent.
Owner:JIANGSU POLYTECHNIC UNIVERSITY +1

Method for preparing electronic grade dimethoxymethane through lateral-line reactive extraction rectifying

The invention provides a method for preparing electronic grade dimethoxymethane through lateral-line reactive extraction rectifying. The method comprises the following steps: adding acid catalyst in a reactive extraction rectifying tower for the tower bottom at one time, adding mixed liquid of formaldehyde and methanol from the lower middle part of the tower continuously, adding glycerin from theupper middle part of the tower continuously, wherein the temperature of the tower bottom is 81.0-83.0 DEG C, the temperature of the tower top is 39.0-42.0 DEG C; obtaining more than 99.70% of dimethoxymethane from the top of the reactive extraction rectifying tower, rectifying distillate from the tower bottom by a lateral-line rectifying tower, wherein the temperature of the top of the lateral-line rectifying tower is 61.0-64.5 DEG C, the temperature of the tower bottom of the lateral-line rectifying tower is 165.0-169.0 DEG C; obtaining methanol and glycerin separately from the top and bottom of the lateral-line rectifying tower and recycling so that produced water at a lateral line reaches discharge standard. By the method, more than 99.70% of electronic grade dimethoxymethane can be prepared, the purity and yield of dimethoxymethane can be further increased; and the technical process is simple, the energy consumption is obviously reduced and no wastewater is discharged.
Owner:江苏沿江化工资源开发研究院有限公司

Equipment and process for purifying helium from BOG gas

InactiveCN111533095AIncrease the permeability coefficientHigh yield and purityNoble gas compoundsSpecific gas purification/separationMolecular sieveSeparation process
The invention discloses equipment and process for purifying helium from BOG gas. The invention relates to the field of BOG gas helium purification. The equipment comprises a primary catalytic dehydrogenation reactor, a cooler, a molecular sieve dryer, a feed gas compressor, a heat exchanger, a membrane separator and a vacuum pump, hydrogen in the helium purification process is reduced by adoptinga three-stage catalytic dehydrogenation reaction, the physical properties of hydrogen and helium are very close, therefore, the hydrogen in the pure helium cannot be removed by using a pressure swingadsorption or cryogenic process, multi-stage catalytic dehydrogenation ensures the purity of helium, a membrane separation process is adopted, BOG gas of the raw materials is concentrated by 30 times,the treatment capacity of the subsequent helium purification process is reduced, the permeability coefficient of gas molecules is increased by adopting a mode of pressurizing before the membrane andvacuumizing after the membrane, helium reaches higher yield and purity by using a smaller membrane area, the recovery rate of helium is increased by returning the desorbed gas of the helium purifier to the front of the feed gas compressor, and the helium yield of the whole device is as high as 99%.
Owner:DALIAN HAIAO MEMBRANE TECH
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