System and preparation method for recovering acetaldehyde from esterification wastewater to prepare acetic acid
A technology for esterifying waste water and acetaldehyde, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of hydroxyl compounds. It can solve the problems of environmental pollution, combustion and heating efficiency, and achieve the effects of reducing energy consumption and improving cooling efficiency.
Active Publication Date: 2020-05-05
海南逸盛石化有限公司
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[0006] The purpose of the present invention is to provide a system and a preparation method for reclaiming acetaldehyde from esterification wastewater to prepare acetic acid. Using this system, acetaldehyde will be efficiently reclaimed from the tail gas coming out of the stripping tower, and acetic acid will be generated, while acetic acid It can be directly used as a solvent by the PTA process to achieve recycling, which not only overcomes the problems of environmental pollution caused by incineration and low combustion heating efficiency, but also avoids the cost of storage and transportation for recovery of acetaldehyde
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[0027] Such as figure 1 As shown, the system for recovering acetaldehyde to prepare acetic acid from esterification wastewater includes a stripper for treating esterification wastewater, and the outlet of the tail gas at the top of the stripper is connected to the inlet of tail gas cooler 1, and tail gas cooler 1 The lower end of the liquid outlet is connected to the inlet of the condensate cooler 2, the outlet of the condensate cooler 2 is connected to the inlet of the condensate collection tank 3, and the condensate outlet at the lower end of the condensate collection tank 3 is connected to the low temperature inlet of the heat exchanger 9 , the upper gas outlet of the condensate collection tank 3, the polyester vacuum system tail gas pipeline and the upper gas outlet of the tail gas cooler 1 are connected to the bottom air inlet of the tail gas washing tower 4 (the polyester vacuum system tail gas is Each liquid ring vacuum pump extracts the tail gas from each reaction kett...
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The invention provides a system for preparing acetic acid by recovering acetaldehyde from esterification wastewater. The system for preparing the acetic acid by recovering the acetaldehyde from the esterification wastewater comprises a stripping tower, tail gas of the top of the stripping tower is collected into a condensate tank through two stages of cooling, and meanwhile, part of the tail gas enters a leaching tower for leaching, condensate is pumped to an acetaldehyde rectification tower to obtain the acetaldehyde, a part of the acetaldehyde obtained is sent to an oxidation reactor to formthe acetic acid; the bottom of the acetaldehyde rectification tower is connected to an ethylene glycol purification tower for recovery of ethylene glycol, and at the same time, the high temperature is utilized to heat the condensate to reduce the energy consumption for recovery; the system can efficiently recover the acetaldehyde from the tail gas from the top of the stripping tower and produce the acetic acid, and the acetic acid can be directly used as a solvent in a PTA process to achieve recycling, the problems of the environmental pollution caused by incineration and the low efficiency of combustion heating are solved, and the cost of storing and transporting the recovered acetaldehyde is avoided.
Description
technical field [0001] The invention belongs to the field of esterification wastewater treatment, and in particular relates to a system and a preparation method for recovering acetaldehyde from esterification wastewater to prepare acetic acid. Background technique [0002] Polyester (PET) is a polymer compound prepared by polycondensation of purified terephthalic acid (PTA) and ethylene glycol (EG). During the esterification reaction stage of its production process, a large amount of organic matter will be produced. The esterification wastewater usually contains ethylene glycol (EG), industrial acetaldehyde, 2-methyl-1,3 dioxolane and other organic substances, and its content is usually between 1.0% and 2.0%, of which EG Aldehyde content is the highest. [0003] At present, the treatment methods of polyester wastewater in foreign countries mainly include: Korea PooJinYong uses ceramic catalytic oxidation + activated sludge method to treat esterification wastewater, in order...
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IPC IPC(8): C07C45/78C07C45/82C07C47/06C07C51/235C07C53/08C07C29/76C07C29/80C07C29/78C07C31/20
CPCC07C29/76C07C29/78C07C29/80C07C45/78C07C45/783C07C45/82C07C51/235C07C47/06C07C53/08C07C31/202Y02P20/10Y02P20/50
Inventor 唐宏林宋晓军
Owner 海南逸盛石化有限公司