50results about How to "Improve balance conversion" patented technology

The invention relates to a new energy-saving technique and a device for composing dimethyl ether by utilizing carbinol, which is characterized by integrating the separation of a reaction product and a substance not reacted as well as the gasification of the raw materials into a tower to be carried out simultaneously. The device of the invention consists of a reaction system and a dividing wall rectification column; the dividing wall rectification column is provided with a block of clapboard on the vertical direction in a normal rectification column; thereby dividing the inner cavity of the rectification column into four areas which are an upper area, a lower area, a left area and a right area; a dimethyl ether product is obtained from the top parts of the reaction product and the substance not reacted output from the reaction system after being separated by the dividing wall rectification column; a gas phase logistics taking carbinol as a main component is obtained from a side line as the incoming stock of the reaction system; while the water in the system is discharged from the bottom of the rectification column; simultaneously, the raw material, carbinol, containing unpurified water enters the rectification column from the right side of the dividing wall to obtain the carbinol and the water in gas phase. The invention can be used for various manufacture techniques and devices by using the carbinol in gas phase to catalyze and compose the dimethyl ether, can reduce device investment to a large extent, simplify the flows as well as reduce energy consumption and operation cost.

The method can be used for prodn. devices producing dimethyl ether by carbinol gas phase catalyzing. The characteristic is the special technology and structure of vaporization extracting-distilling tank and ingenious combination of vaporization extracting-distilling tank and dimethyl ether rectificating tank, the purpose of recovering carbinol can be realized without building carbinol recovering tank used for separating, purifying and recovering carbinol in mixed liquid in boiler of dimethyl ether rectificating tank. Another characteristic is that two different standard dimethyl ether (the one in them is high purity) can be produced simultaneously by the invention.

The invention discloses a method for coproduction of 1,3-butadiene and ethyl tert butyl ether from methanol to olefin (DMTO) byproduct coal-based mixing C4. The method sequentially comprises the following three working sections: coal-based mixing C4 pretreatment and etherification working section, butene oxidative dehydrogenation working section and butadiene refining working section, wherein the coal-based mixing C4 pretreatment working section sequentially comprises the following steps: (1) removing a C5 component; (2) implementing hydroisomerization; and (3) condensing isobutene; and in the etherification step, isobutene obtained from the top of an isobutene condensation tower is pumped into an etherification tower together with ethanol for an etherification reaction. Furthermore, the invention discloses a combination device for coproduction of 1,3-butadiene and ethyl tert butyl ether from methanol to olefin (DMTO) byproduct coal-based mixing C4. The method can be used for realizing the effective and comprehensive utilization of 1-butene, isobutene, 2-butene and 1,3-butadiene in the coal-based mixing C4 as well as few C5 component, so that the comprehensive utilization rate is improved, and the method is a new trend of comprehensive utilization of the coal-based mixing C4.

The invention discloses an ionic liquid with 1-isobutyl-3-methylimidazole structure and the preparation method and the application among biological transesterification reaction, belonging to technical field of organic compound preparation and application. The preparation method is characterized in that: equimolar methylimidazole and bromination isobutene are mixed directly and reacted for 18 hours at the temperature of 60 DEG C before heated slowly to 85 DEG C for continuous reaction until the reaction system is changed into sticky transparent liquid; double decomposition reaction is made for 1-isobutyl-3-methylimidazole bromide salt and equimolar inorganic salt containing different anions to get each kind of ion liquid crude product (the anion comprises PF6[-] and N(CF3)2)[-]. When the ion liquid crude product cannot be detected by bromine ion using super-pure water washing, acetone with five times of volume is used for dilution (the viscosity is close to water); active carbon and silica gel are respectively adopted for decoloration before vacuum distillation is made to remove acetone and non-reactant, thereby getting colorless products. The the preparation method for ionic liquid with 1-isobutyl-3-methylimidazole structure has the advantages of simple preparation technique, environmental protection, low cost, high purity for the ion, and thus can be applied in spectrum study and biocatalysis reaction.

The invention relates to a method for preparing ethene by ethanol dehydration and mainly solves problems of large ethanol loss, high waste water COD value and high energy consumption apparatus in a production process flow of preparing ethene by ethanol dehydration of a prior art. According to the invention, fresh ethanol and recovered ethanol enter a gas stripping column to realize vaporization separation in the gas stripping column; kettle liquid in a column kettle of the gas stripping column is discharged out of a system continuously; ethanol steam is obtained at top of the gas stripping column and enters into the reaction system; dehydrated reaction products enter a washing and alkali washing system to remove impurities of ethanol, acetaldehyde and carbon dioxide, etc.; crude ethene obtained after the washing and alkali washing enters into an ethene rectifying tower; and ethene product is obtained at the top of the tower. The above technical scheme well solves the problems and can be applied to industrial production for preparing ethene by ethanol dehydration.

The invention relates to a nickel-based catalyst for preparing butane-1 by butane-2 hydroisomerization, and mainly solves the technical problems of low equilibrium conversion rate and high olefin hydrogenation rate of butane-2 hydroisomerization catalyst butane-1 in the prior art. By adopting the technical proposal that the nickel-based catalyst for preparing the butane-1 by the butane-2 hydroisomerization comprises the following components in percentage by weight: (a) 5.0 to 40.0 percent of metal nickel or oxides thereof, (b) 0.01 to 6.0 percent of at least one element or oxides thereof selected from rare earth, (c) 0.01 to 2.0 percent of at least one element or oxides thereof selected from IA or IIA in the periodic table of elements, (d) 0 to 12.0 percent of at least one element or oxides thereof selected from silicon, phosphorus, boron or fluorine, (e) 0 to 10.0 percent of at least one element or oxides thereof selected from IVB in the periodic table of elements, and (f) the balance being aluminum oxide carrier; and the nickel-based catalyst the solves the problems well, and can be used in the industrial production of the butane-1 prepared by cracking C4 or butane-2 component rich in refinery C4.

The invention provides a method for preparing monoisopropanolamine by virtue of reactive rectification. The method comprises the following steps: feeding liquid ammonia from the lower part of a reactive rectification tower by use of a pressure reducing valve, meanwhile, feeding propylene epoxide from the second tower plate at the upper part of the tower at 25 DEG C, and feeding catalyst water from the top of the tower at a temperature ranging from 15 to 40 DEG C, wherein the feeding molar ratio of the fed ammonia to the propylene epoxide is (0.8-2.0): 1, the feed quantity of the water is 10-50% of the mass percentage of the total feed quantity, and the total feed quantity is the mass sum of the water, liquid ammonia and propylene epoxide; the reactive rectification tower comprises 25-45 tower plates; the temperature at the top of the tower is controlled within the range of 31-50 DEG C, the temperature of the tower kettle is within the range of 165-310 DEG C, and the tower is under the pressure of 0.8MPa to 1.5MPa; the liquid ammonia feeding position is at the tower kettle of the reactive rectification tower or the first or second tower plate above the tower kettle. Compared with the traditional process, the method has the advantages that the content of monoisopropanolamine is increased by nearly 100%, and the content of triisopropanolamine is reduced by about 95% in comparison with the traditional process.

The invention belongs to the technical field of inorganic chemical industry sulfuric acid preparation, and discloses a hydrogen sulfide wet sulfuric acid preparation method with high conversion rate and low emission. According to the hydrogen sulfide wet sulfuric acid preparation method, interlayer hot air mixed cold shock is adopted, and a steam superheater is also combined for process gas cooling; O2 concentration of the process gas is increased, equilibrium conversion rate of SO2 catalytic oxidation is increased, and SO2 total conversion rate is increased further; and at the same time, a NWS series high-efficient wet conversion specially-used vanadium catalyst is used, so that the SO2 total conversion rate reaches 99.2%, and exhaust gas emission of a wet conversion sulfuric acid preparation apparatus is reduced.

The invention relates to a method for preparing rosin ester by coupling catalytic esterification and separation, which comprises the following operation steps: (1) mixing an alcohol compound, a rosin and a solvent, and dissolving; (2) putting the dissolved substance in the step (1) into an esterification reactor, and introducing 0.01-10.0-MPa CO2 to perform esterification reaction at 150-300 DEG C; (3) recovering the gas phase in the esterification reaction process, sending the gas phase into a gas-liquid separator through an expander, and returning the separated CO2 and newly supplemented CO2 into the esterification reactor through a turbine compressor; and (4) after reacting in the esterification reactor for 1.0-8.0 hours, relieving the pressure, and taking the obtained product out of the esterification reactor. The invention aims to provide a preparation method which has the advantages of lower cost and high rosin ester quality.

The invention discloses a catalyst for synthesizing diphenyl carbonate. The catalyst comprises a molecular sieve and a loaded active component, the molecular sieve is an alkali metal modified microporous molecular sieve, and the active component is binary mixed metal oxide AO/B<c>O<d>, wherein A is selected from Sn, Ga or Zn, B is selected from Zr, Cr or La, and a, b, c and d are stoichiometric numbers. Due to the addition of a lithium additive, the energy barrier in the side reaction process is remarkably improved, and the reaction speed of the side reaction is reduced. The tin oxide and other active components obviously lower the energy barrier in the main reaction process, and enhance the reaction speed of the main reaction. The catalyst provided by the invention has very high catalytic activity, effectively realizes diphenyl carbonate synthesis reaction, inhibits the occurrence of ether side reaction, and reduces the energy consumption of the production process.