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149results about How to "Reduce production consumption" patented technology

Preparation method of polyester for environment-friendly antimony-free film

InactiveCN103554452AImproved performance of polyesterL value increasedReaction temperatureSlurry
The invention relates to a preparation method of polyester for an environment-friendly antimony-free film. The method comprises the following steps of (A) adopting terephthalic acid and ethylene glycol as basic raw materials to be made into slurry, adding the slurry into a reactor to have esterification reaction for 1h to 4h under the condition that the temperature is 220DEG C to 260DEG and the pressure is 0.1MPa to 0.3MPa, and obtaining an esterification product; (B) carrying out the pre-polycondensation reaction for 0.5h to 1.0h to obtain a pre-polymer under the condition that the reaction temperature is 240DEG C to 270DEG C and the pressure is gradually reduced from the absolute pressure of 101kPa to 600Pa; (C) carrying out the final polycondensation reaction for the prepolymer obtained in the step (B) for 1h to 2h to obtain a polyester product under the condition that the temperature is 270DEG C to 290DEG C and the absolute pressure is 150Pa to 50Pa. The liquid titanium catalyst and accessory ingredients of a given quantity can be added into the reaction system before or after the esterification reaction. The synthesized polyester does not contain precious metal such as antimony and is qualified in properties and suitable for producing a two-directional stretching film.
Owner:CHINA PETROLEUM & CHEM CORP

Energy-saving preparation technology of high-quality glucose powder

The invention discloses an energy-saving preparation technology of high-quality glucose powder. The technology comprises the following steps: by using starch as a raw material, mixing syrup, liquefying, saccharifying, decoloring and removing impurities by an ultrafiltration membrane, removing salt by ion exchange, purifying by a simulated moving bed, collecting the cut fraction with glucose content of at least 99.5%, and then, performing membrane concentration, vacuum belt drying, cooling and grinding to obtain the finished product of the high-quality glucose powder. According to the preparation technology disclosed by the invention, preparation flows of glucose are shortened, a procedure of evaporation and concentration is replaced by membrane concentration, the steam consumption is reduced, the production cost is lowered, meanwhile, the glucose decomposition loss and production of harmful by-products caused by high temperature concentration of liquid glucose are reduced, and the product quality is improved; the glucose is purified by means of the simulated moving bed technology, so that the content of impure glucose in products is decreased, and the glucose purity is up to more than 99.5%; the glucose syrup is dried by means of vacuum belt drying, and is further ground so as to form the crystalline glucose powder, so that the production efficiency is improved.
Owner:SHANDONG LONGLIVE BIO TECH CO LTD

Method for preparing chloroethane from chlorination by-product hydrogen chloride

The invention discloses a method for preparing chloroethane from chlorination by-product hydrogen chloride. The method adopts a reaction rectification technology. According to the method, a reactor is connected to a first rectifying tower, water in the first rectifying tower flows out the first rectifying tower from tower bottom and then is recycled, a tower overhead fraction of the first rectifying tower goes through a first condenser, a part of ethanol is returned, a part of the ethanol is collected and then is fed into a storage tank for recycle, chloroethane and a less amount of ether mixed vapor are fed into a second rectifying tower, a tower overhead fraction of the second rectifying tower goes through a second condenser, a part of chloroethane is returned, a part of chloroethane is collected and then is fed into a storage tank for recycle, and the by-product ether is obtained by a reboiler. The method realizes timely removal of produced chloroethane and water from a system, effectively accelerates a positive reaction speed, realizes effective recovery and recycle of unreacted hydrochloric acid and ethanol, has simple processes, a high ethanol conversion rate, low production consumption and good income and realizes zero discharge.
Owner:HUAIYIN INSTITUTE OF TECHNOLOGY

Method for preparing acetone through low temperature gas phase dehydrogenation of water-containing isopropanol

The invention relates to a method for preparing acetone through low temperature gas phase dehydrogenation of water-containing isopropanol, and belongs to the technical field of fine chemical industry. According to the present invention, a dehydrogenation raw material is from a production waste solution of an anti-aging agent 4010NA, a waste solution pre-treatment distillation kettle temperature is 80-90 DEG C, a gas phase temperature is 80-82 DEG C, a dehydrogenation raw material distillation rate mass percentage content is 92.86%, a copper-base catalyst is selected, a continuous dehydrogenation reaction is performed on a fixed bed, a liquid space velocity is 0.2-3.0 h<-1>, the system pressure under a nitrogen stream is less than or equal to 0.1 MPa, a tail gas flow rate is 50-400 mL/min, a reaction temperature is 160-220 DEG C, a material vaporization temperature is 150-185 DEG C, and the vaporized material is subjected to thermal insulation at a temperature of 195-220 DEG C; the waste solution can be converted into the raw material acetone for producing the anti-aging agent 4010NA so as to reduce the production consumption of the acetone; and the method has characteristics of low reaction temperature, low energy consumption, easy operation, high acetone selectivity, and easy reaction solution separation, wherein the single pass conversion rate of the isopropanol is more than 50%, and the acetone selectivity is more than 99%.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for controlling boron content of boron steel

The invention discloses a method for controlling the boron content of boron steel. The method includes the steps that ferro-aluminum is added for deoxygenation when the steel output of a converter ranges from two fifths to one half of the total steel output, and the mass percentage content of acid saluted aluminum is controlled to be 0.03%-0.05% after molten steel is completely deoxidized; ladle top slag is deoxidized after steel output is completed, wherein a slag modifying agent is added to the slag surface of a ladle, bottom blowing and stirring are performed for 3-5 min, the online bottom blowing flow of the ladle is controlled to range from 400 NL / min to 600 NL / min, and the sum of the mass percentage content of FeO and the mass percentage content of MnO in the molten steel is controlled to be 5% or less; and in the refining process of the molten steel, when the mass percentage content of Als in the molten steel reaches 0.020%-0.040% and the mass ratio of Als to Alt is larger than 0.85, the component B in the molten steel is adjusted through ferroboron, the mass percentage content of the component B is controlled to range from 0.0009% to 0.0015%, and the absorptivity of the component B in the steel is made to range from 80% to 85%. According to the technical scheme, the technical problem that the boron content of boron steel is beyond the control range in the prior art is solved, and performance of boron steel is improved.
Owner:SHOUGANG JINGTANG IRON & STEEL CO LTD

Crystallization method through gas-liquid biphasic reaction and apparatus thereof

A crystallization method through gas-liquid biphasic reaction is disclosed. Liquid materials react with gas phase materials to produce solid phase crystals. The method includes the following steps that: in a low temperature crystallizer, liquid materials and gas phase materials are subjected to chemical reactions so as to realize generation and growth of crystal nucleuses, wherein the chemical reaction process is a biphasic continuous reaction process that comprises a chemical reaction process of which the liquid materials are continuous phase and the gas phase materials are dispersed phase and a chemical reaction process of which the gas phase materials are continuous phase and the liquid materials are dispersed phase; then in a high temperature crystallizer, a reaction process of using a liquid phase as a continuous phase and a gas phase as a dispersed phase on the crystal nucleuses is performed so as to crystallize and make the crystal nucleuses become bigger; a high temperature crystal plasma separator is used to obtain solid phase crystallized products. The crystal nucleuses can be automatically returned in a crystal nucleus system so that formation and quantity of the crystal nucleuses can be controlled. The grown crystals are taken out in a high temperature area of an apparatus and the crystal nucleuses are formed in a low temperature area of the apparatus. The processes of generation and growth of the crystal nucleuses are performed in different containers of a gas-liquid biphasic response apparatus provided in the invention.
Owner:武奋超
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