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

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 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.

A solid superacid bifunctional catalyst and a preparation method thereof. The catalyst is obtained by loading a hydrogenation / dehydrogenation metal component on metal oxide supported with ClO<4-> acid radicals; and the metal component is one or more selected from Pt, Pd and Ni. The preparation method is as follows: (1) evenly mixing a soluble chloride-containing metal salt water solution with a soluble alkali precipitator; subjecting the mixed solution to a hydro-thermal treatment under a closed condition to obtain a metal salt hydrogel; subjecting the hydrogel to aging and layering; drying and roasting precipitate at a lower layer to obtain a ClO<4-> / metal oxide; (2) impregnating the ClO<4-> / metal oxide in an ammonium perchlorate solution; then filtering, drying and roasting to obtain a metal oxide loaded with ClO<4-> radicals; and (3) impregnating the metal oxide loaded with ClO<4-> radicals in a water solution of a soluble hydrogen and dehydrogenation metal component compound; and then filtering, drying and roasting to obtain the solid superacid bifunctional catalyst. The catalyst provided by the invention can be used for catalysis of an isomerization reaction of straight-chain paraffin, and has the characteristics of low reaction temperature, high conversion rate and good selectivity.

The present invention provides a kind of bifunctional catalyst for producing biodiesel with low freezing point and its preparation method and application. 2 P is a bimetallic active component, and the content of the active component is 0.05 to 5.05 wt% based on the weight of the carrier as 100%; the method for preparing biodiesel with low freezing point is to use vegetable oil hydrodeoxygenated oil as raw material , add the above-mentioned bifunctional catalyst, and carry out continuous reaction in the reactor, the reaction temperature is 250-370°C, the reaction pressure is 1.0-4.0MPa, and the mass space velocity of the vegetable oil hydrodeoxygenated oil is 1.0-4.0h ‑1 , the volume ratio of hydrogen to vegetable oil hydrodeoxygenated oil is 300-800:1. Catalyst of the present invention is carried Pd-Ni on the molecular sieve of hierarchical porous nanometer SAPO-31 2 The bifunctional catalyst prepared by the P bimetal has the advantages of less noble metal Pd consumption, high reactivity and isomerization selectivity, good stability, and high yield of biodiesel.