Apparatus for increasing acrylonitrile conversion rate in styrene-acrylonitrile copolymerization reaction
A technology of acrylonitrile conversion rate and copolymerization reaction is applied in the field of petrochemical equipment, which can solve the problem of increasing the investment and operating cost of unreacted monomer and solvent recovery unit equipment, and reducing the single-line production capacity of styrene-acrylonitrile copolymer, tons per ton. Product investment increases and other issues, to achieve the effect of saving investment costs and operating costs, improving production capacity, and saving energy consumption
Inactive Publication Date: 2014-11-26
JILIN DESIGNING INST OF CNPC NORTHEAST REFINING & CHEM ENG
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Problems solved by technology
[0005] The conversion rate of acrylonitrile is low, which can lead to the following adverse consequences: at first, it will cause low raw material utilization rate and poor product quality; secondly, this will reduce the single-line production capacity of styrene-acrylonitrile copolymer, and the investment per ton of product will increase; in addition, This will also increase the amount of unreacted monomer and solvent in the subsequent unreacted monomer and solvent recovery unit, increasing the equipment investment and operating costs of the unreacted monomer and solvent recovery unit
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[0012] Attached below figure 1 And specific embodiments, the present invention will be described in detail.
[0013] A device for two acrylonitrile-styrene copolymerization reactions in series. The reacted materials include acrylonitrile, styrene, diluent, and molecular weight regulator. The diluent is ethylbenzene and the molecular weight regulator is dodecyl mercaptan. The ratio of materials for copolymerization: acrylonitrile: styrene: ethylbenzene: dodecyl mercaptan=(20%~30%):(50%~70%):(10%~35%):(0~2 %), expressed as %wt in weight percent; Acrylonitrile and styrene enter 1# reactor 1 through 1# reactor feed port 7 respectively, and heat oil to 110°C in reactor jacket 21, Into the thermal trigger. Since the reaction is a heat-dissipating reaction, the temperature will continue to rise as the reaction progresses. In order to prevent explosion, use circulating water to withdraw the heat after the start of the reaction to ensure that the reaction temperature is between 140 and ...
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The present invention relates to a petroleum chemical industry apparatus, especially to an apparatus for increasing an acrylonitrile conversion rate in a styrene-acrylonitrile copolymerization reaction. According to the apparatus, at a late stage of a copolymerization reaction, two reactors connected in series are respectively added with a forced reflux pipeline, part of materials are forced to reflux to the reactor so as to enhance reactant mixing o in the reactor, such that the materials in the reactor are uniformly mixed, an acrylonitrile conversion rate is more than 75% and can reach 80%, production capacity is improved, single line production capacity of the apparatus is increased to 80000 ton / year, production operation is stable, mixing degree of the materials in the reactor is uniform, and the product quality is at the international advanced level. According to the present invention, residual amounts of monomers and solvents are reduced after the reaction, a monomer yield is improved, cost of monomer and solvent recovery is saved, equipment investment cost of the production unit is saved, and operation cost of the apparatus is saved so as to reduce product production cost.
Description
Technical field [0001] The invention relates to a petrochemical plant, in particular to an acrylonitrile-styrene copolymerization reaction plant. Background technique [0002] Acrylonitrile-styrene copolymer, also known as SAN or AS, is a polymer compound made by copolymerizing acrylonitrile and styrene. Acrylonitrile-styrene copolymer has thermoplasticity, is not easy to change color, is not affected by dilute acid, dilute alkali, dilute alcohol and gasoline, has excellent heat resistance and solvent resistance, and is used to manufacture oil-resistant mechanical parts, instrument cases, and instrument panels , Battery box, tractor fuel tank, battery shell, packaging container, daily necessities, etc., is also a blending material mainly used for the production of ABS resin. [0003] In the process of industrial production, the synthesis of styrene-acrylonitrile copolymer has undergone the first-generation emulsion polymerization method, the second-generation suspension emulsion p...
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IPC IPC(8): C08F212/10C08F220/44C08F2/38C08F2/01
Inventor 周江沛张洁婧巩传志李欣平陈长松谢省宾李响徐森
Owner JILIN DESIGNING INST OF CNPC NORTHEAST REFINING & CHEM ENG