Process for producing ammonium sulfate by adopting negative pressure double-countercurrent evaporation and crystallization mode
A technology of evaporative crystallization and crystallization, applied in the direction of ammonium sulfate, etc., can solve the problem of underutilized heat of high-temperature materials
Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP
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The disadvantage of this method is that the heat of the high-temperature material is not fully utilized
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[0018] In this embodiment, the negative pressure double-effect countercurrent evaporation and crystallization method is used to treat dilute ammonium sulfate liquid, a by-product of the acrylonitrile plant, which is mainly composed of two sets of equipment: evaporation crystallization and evaporation concentration. A set of crystallization evaporator 1, crystallizer circulation pump 5 and crystallizer heater 3 is used as a first-effect evaporation and crystallization equipment; a set of concentration evaporator 2, concentrator heater 4 and concentrator circulation pump 6 is used as a second-effect Concentration evaporation equipment. Using the medium-pressure steam 15 to heat the first effect through the forced circulation of the crystallization heater 3 to conduct crystallization and evaporation, and then use the secondary steam 16 evaporated from the first effect to provide a heat source for the second effect to concentrate the raw material liquid through the forced circulati...
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The invention relates to a process for producing ammonium sulfate by adopting a negative pressure double-countercurrent evaporation and crystallization mode. One-effect evaporation and crystallization equipment comprises an evaporator, a crystallizer circulating pump and a crystallization heater; two-effect condensation and evaporation equipment comprises a condensation evaporator, a condenser heater and a condenser circulating pump; and the evaporation of the one-effect evaporation and crystallization equipment and the two-effect condensation and evaporation equipment is carried out under negative pressure by using a vacuum pump and a communicating pipe between the one-effect evaporation and crystallization equipment and the two-effect condensation and evaporation equipment. The one-effect evaporation and crystallization equipment is heated by using medium pressure steam for crystallization and evaporation, then secondary steam evaporated by the one-effect evaporation and crystallization equipment is utilized to provide a heat source for the two-effect condensation and evaporation equipment for extracting a feed solution, and condensed materials enter the crystallization evaporator of the one-effect condensation and evaporation equipment to form a saturated ammonium sulfate crystal solution, and centrifugally separated to obtain a finished product of the ammonium sulfate. Steam evaporated by the two-effect condensation and evaporation equipment is condensed and cooled by the condenser and an emptying cooler, condensate enters a quenching water tank, and noncondensable gasis discharged through a water-ring vacuum pump. Heat value of secondary steam evaporated by the one-effect evaporation and crystallization equipment after reconstruction is utilized fully, which reduces the consumption of heating steam, and lowers the temperature of steam evaporated by the two-effect evaporation and crystallization equipment.
Description
technical field [0001] The invention belongs to an ammonium sulfate production device, in particular to a process for producing ammonium sulfate by adopting negative pressure double-effect countercurrent evaporation and crystallization. Background technique [0002] Ammonia gas is blown into dilute sulfuric acid to make it supersaturated, and then the ammonium sulfate product is obtained through centrifugation. However, since the introduction of large nitrogen fertilizer equipment for urea production, the previous medium nitrogen fertilizer production equipment has also been changed to produce urea. At present, ammonium sulfate mainly absorbs ammonia in coke oven gas by dilute sulfuric acid or removes unreacted ammonia in the reactor by adding sulfuric acid and ammonia in the acrylonitrile unit for neutralization and other production processes (ammonia in the sulfuric acid system) It is obtained by evaporating and crystallizing dilute ammonium sulfate solution from acid tail...
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IPC IPC(8): C01C1/24
Inventor 宫晓燕张春雨孟宪会张沛存于卫成李振清吴玉栋候伟夏玮张明坤郭洪涛
Owner CHINA PETROLEUM & CHEM CORP