9 results about "Methyl tert-butyl ether" patented technology

This invention relates to an alcohol-based fuel additive, its preparation method, and its application, belonging to the technical field of diesel fuel additives. The additive, by weight, comprises: a mixture of C3-C10 fatty alcohols, fatty acid methyl esters, methyl tert-butyl ether, isoamyl nitrate, dimethyl carbonate, and diesel fuel. The mass ratio of methyl tert-butyl ether to dimethyl carbonate is [value missing]. This invention employs a stepped feeding process, solving the problem of combustion improver failure caused by high shear heat generation by cooling the fuel before adding isoamyl nitrate, and ensuring long-term fuel stability at -10°C using a specific polarity gradient ratio. The fuel prepared by this invention has a high cetane number, strong power, and good anti-stratification effect, making it suitable for compression ignition engines.

The application relates to a high-purity melittin purification method using pH zone refining countercurrent chromatography. In order to overcome the defects of the prior art, a solvent system composed of 4-12% methyl tert-butyl ether, 42-50% n-butanol, 4-12% acetonitrile and 42-50% deionized water is used, a high-purity melittin solution is purified by using the pH zone refining countercurrent chromatography, and the finished high-purity melittin is obtained through concentration and drying. The application does not use solid fillers, does not cause loss to the sample, can almost recover all the melittin in the crude melittin, the yield is more than 90%, and the application is suitable for batch purification of high-purity melittin.

The present invention relates to the technical field of solid waste recovery and provides a method for efficiently and conveniently recovering asphalt on the basis of a small amount of an asphalt mixture. The method comprises the following steps: S1, taking an asphalt mixture sample, adding water, and performing ultrasonic cleaning to wash away impurities from the surface of the sample; S2, placing the impurity-removed and dried sample in a mixed solvent for soaking for 20-40 min until the surface of an aggregate is not coated with asphalt, the mixed solvent comprising 1,1-diethoxyethane and methyl tert-butyl ether; and S3, performing vacuum filtration and centrifugation on the mixture in step S2 to separate out a supernatant, placing the supernatant in a fume hood for preliminary volatilization and then in an air blast drying oven to evaporate the solvent at 60-105ºC to obtain recovered asphalt. By means of the compounding of low-boiling solvents 1,1-diethoxyethane and methyl tert-butyl ether, combined with subsequent vacuum filtration, centrifugation and volatilization treatment, the present invention realizes an efficient and convenient method for recovering asphalt from the asphalt mixture. Compared with the existing Abson method and rotary evaporator method, the method has the advantages of high fidelity of recovered asphalt and no organic solvent residue.

The invention discloses a high-stability methanol energized fuel and a preparation method thereof.The high-stability methanol energized fuel is prepared from 70 to 75 parts of methanol, 3 to 5 parts of dimethyl carbonate, 3 to 4 parts of glycerol, 5 to 7 parts of high-carbon isoparaffin, 4 to 6 parts of bio-based high-carbon ester, 2 to 3 parts of bio-based emulsifier compound, 0.1 to 0.3 part of modified nano cerium oxide and 0.05 to 0.07 part of tri-tert-butyl phosphate; the corrosion inhibitor comprises the following components in parts by mass: 0.1 to 0.2 part of methyl tert-butyl ether and 0.03 to 0.05 part of benzotriazole. The high-stability methanol energized fuel disclosed by the invention has the stability and heat value of methanol fuel, and also has good temperature resistance; the preparation is simple, the operation is convenient, no additional heat source is needed, and the cost and energy consumption are reduced.

The invention discloses a pretreatment optimization method for measuring vitamin E in sea buckthorn seed oil, and belongs to the technical field of analysis and detection. The invention aims to solve the problems of easy degradation of vitamin E, easy emulsification, low subsequent extraction efficiency and tedious operation in the saponification process of seabuckthorn seed oil in the prior art. The method comprises the following steps: firstly, mixing the sea buckthorn seed oil with an attapulgite and silicon dioxide composite adsorbent for pretreatment; under the protection of inert gas, a saponification reaction is carried out, and a saponification solution contains a composite antioxidant and a phase transfer catalyst; then carrying out automatic extraction by adopting a mixed solvent of ethyl acetate and methyl tert-butyl ether; and finally, purifying the extract through a solid-phase extraction column to obtain a vitamin E-containing component, and preparing the vitamin E-containing component into a test solution. The method is mainly used for providing an efficient, stable and reliable pretreatment sample for chromatographic determination of vitamin E in seabuckthorn seed oil. The invention discloses a pretreatment optimization method for measuring vitamin E in sea buckthorn seed oil.

The invention relates to a method for preparing a didarcib crystal form, which comprises the following steps: dissolving didarcib in a first organic solvent, cooling to separate out part of didarcib crystals, and adding a second organic solvent to further separate out crystals; according to the method, potential safety hazards and health risks caused by adding a low-boiling-point solvent (methyl tert-butyl ether) at a high temperature are avoided; the selected solvent is safe, low in cost and easy to obtain, the obtained crystal is high in purity and yield, and industrial production is facilitated.

The utility model belongs to the technical field of MTBE (Methyl Tert-Butyl Ether) production, and particularly relates to an MTBE production device taking C4 as a raw material. The MTBE production device taking C4 as the raw material comprises a raw material C4 pipeline and a methanol raw material tank, the raw material C4 pipeline is connected with a raw material preheater through a catalytic rectifying tower aftercooler, methanol in the methanol raw material tank is conveyed to the raw material preheater through a pipeline, an outlet of the raw material preheater is connected with an etherification reactor, and an outlet of the etherification reactor is connected with the methanol raw material tank. The etherification reactor is connected with a lower catalytic rectifying tower through a catalytic rectifying tower feeding heat exchanger and a catalytic rectifying tower preheater, and the lower catalytic rectifying tower is connected with an upper catalytic rectifying tower. According to the MTBE production device taking C4 as the raw material, the catalytic rectifying tower aftercooler and the tower bottom high-temperature MTBE raw material heat exchange system are arranged, so that a multi-stage waste heat recovery network is formed, steam condensate waste heat is used for preheating the raw material, the steam consumption is reduced, and energy conservation, consumption reduction and efficient utilization of resources are realized.

The present disclosure provides a method and system for integrating MTBE production with isobutylene production, the method including isomerizing a mixed hydrocarbon feed stream to form an isobutane stream; dehydrogenating the isobutane stream to form an isobutylene stream; reacting the isobutylene stream with methanol to form an MTBE product stream; separating at least a portion of impurities from the MTBE product stream to form a MTBE feed stream; decomposing MTBE in the MTBE feed stream to form a decomposed MTBE product stream; treating the decomposed MTBE product stream with water to form a wash water stream comprising methanol and a water-washed product stream comprising isobutylene; separating methanol from the wash water stream to form a methanol recovery stream; separating at least a portion of DME and metal ions from the methanol recovery stream to form a purified methanol stream; and feeding the purified methanol stream to the MTBE synthesis reactor.

The present application relates to the field of groundwater remediation, and discloses a composition for groundwater remediation, application and method thereof.The composition contains a slow-release oxidant and an iron-based molecular sieve composite material; the slow-release oxidant has a core-shell structure, the shell layer is polylactic acid, and the core layer is a metal peroxide and citric acid; the iron-based molecular sieve composite material contains Silicalite-1 molecular sieve and Fe element loaded on the Silicalite-1 molecular sieve, and the weight ratio of the slow-release oxidant to the iron-based molecular sieve composite material is greater than or equal to 45.The composition for groundwater remediation has the advantages of high activity and durability, can achieve efficient and long-acting degradation of methyl tert-butyl ether in groundwater, and can more effectively remediate groundwater.