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Process for cooling and separating gas phase mixture on top of polyester process column

A technology of tower top gas and process tower, which is applied in the direction of separation method, dispersed particle separation, steam condensation, etc., can solve the problems of high water content in waste gas, high energy consumption, and no contribution to efficiency, so as to reduce COD content and improve separation efficiency Effect

Active Publication Date: 2011-11-16
SINOPEC YIZHENG CHEM FIBER
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Problems solved by technology

[0006] The disadvantage of the above technology is that the waste water from the esterification process tower of the polyester plant needs to be transported to the vicinity of the heat medium heating furnace far away from the polyester plant to use steam for heating, and the water content in the exhaust gas during the "stripping" process Larger, relatively high energy consumption, and this "stripping" process does not contribute to the efficiency of the process tower for separating water and glycol

Method used

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  • Process for cooling and separating gas phase mixture on top of polyester process column
  • Process for cooling and separating gas phase mixture on top of polyester process column

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Embodiment Construction

[0013] The invention is a new process for directly separating organic matter waste gases such as acetaldehyde, which is a by-product of polyester, from waste water, which is closely combined with the esterification process tower of a polyester plant. Its feature is to cool the gas phase mixture at the top of the esterification process tower of the polyester plant, and all the condensate is introduced into the stripping tower to carry out stripping and separation of volatile organic compounds such as acetaldehyde. The stripper is combined with the top condenser and reflux tank of the process tower, and one device performs multiple different process operations: a blower is used to send air into the bottom of the stripper for stripping waste water Acetaldehyde waste gas, using compressed air as the power of the jet pump, sucks the tail gas discharged from the gas phase pipe of the vacuum system of the polyester plant, and discharges it to the stripping tower system to form a cooli...

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Abstract

The invention provides a novel process for cooling and separating a gas phase mixture on the top of a polyester process column. The gas phase mixture firstly enters a condenser for condensation, condensed liquid taking wastewater as a main component fully enters a stripping tower, air is blown to the bottom of the stripping tower to cool the high-temperature wastewater refluxed on the top, and volatile organic matters in the wastewater are separated into gas phase and discharged from the top; and simultaneously, a compressed air ejector pump or hydro-stream ejector pump is adopted, low-pressure tail gas of a polyester device is extracted into a gas phase pipeline on the top of the stripping tower, tail gas rich in air is discharged, acetaldehyde concentration in the prior tail gas is diluted into a safe concentration range and then sent to a gas-liquid separator for gas-liquid separation, liquid is refluxed to the stripping tower, and the tail gas is sent to a heating furnace of the polyester device for combustion. The process has the technical advantages of separating organic waste gases contained in the wastewater such as acetaldehyde and the like on line, improving the separating efficiency of the process column for water and glycol, reducing the COD content in the finally discharged wastewater, and the like.

Description

technical field [0001] The invention relates to a PTA polyester production process, in particular to the cooling and separation of a gas-phase mixture in a process tower used in the esterification stage, and belongs to the technical field of chemical production. Background technique [0002] The production of polyethylene terephthalate (abbreviation: polyester, PET) by PTA method is through continuous esterification and polycondensation reaction of purified terephthalic acid (PTA) and ethylene glycol (EG) with high purity. Obtain polyester products (including: melt or chips). These reactions are carried out in multiple reactors connected in series. First, the esterification reaction is carried out under positive pressure, and the obtained esterified product is further subjected to polycondensation reaction under negative pressure. When the degree of polymerization reaches a certain level and the product meets the specified intrinsic viscosity, the reaction It's done. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D5/00C02F1/04C08G63/78
Inventor 朱雪灵石庆华姜兴国
Owner SINOPEC YIZHENG CHEM FIBER
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