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Polyester synthesis apparatus with low-temperature cooling facility

A cooling device and synthesis equipment technology, applied in the synthesis field of polyester prepared by condensation polymerization, can solve the problems of difficult to achieve high vacuum, high monomer consumption, water pollution, etc., and achieve the reduction of follow-up environmental protection investment, low investment cost, The effect of stabilizing vacuum

Active Publication Date: 2009-08-26
BEIJING HAIKE HUACHANG NEW MATERIAL TECH
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Problems solved by technology

[0005] The purpose of the present invention is to optimize polydibasic acid glycol ester polycondensation equipment, provide a kind of polyester synthesis equipment with low-temperature cooling device, overcome the partial vacuum entrainment gas that exists in existing polyester polycondensation equipment can not recycle, polymerization process Unstable vacuum, difficult to achieve high vacuum, inability to use mechanical vacuum pumps, water pollution, high monomer consumption, etc.; at the same time reduce vacuum fluctuations in equipment and reduce corrosion of vacuum generating devices

Method used

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Effect test

Embodiment 1

[0019] See figure 1 or figure 2 . Transform the 50LPBT semi-continuous experimental equipment. The volume of the polycondensation reaction device 1 is 50L. This experimental equipment uses a 15L rotary vane vacuum pump as a vacuum generating device. In the experiment before the transformation, part of the tetrahydrofuran could not be cooled down and entered the vacuum pump, causing the emulsification of the vacuum oil and the corrosion of the vacuum pump. Usually, a new vacuum pump oil needs to be replaced in one experiment, and the vacuum pump needs to be overhauled after one month of experiment. Cause the equipment to fail to operate normally. According to the technical scheme of the present invention, the experimental equipment was modified. A low-temperature cooling device 3 cooled by dry ice was added before the vacuum generating device and after the conventional cooling device 2, and the cooling temperature was about minus 60°C. The feed was 30kg in one experiment, of which...

Embodiment 2

[0021] See figure 1 or figure 2 . The continuous PET production line with an annual output of 4,000 tons was transformed, and a low-temperature cooling device 3 for compressor refrigeration with a refrigerating temperature of minus 70°C was added before the vacuum generator and after the conventional cooling device 2. The production line uses a steam jet pump as a vacuum generator, and the volume of the polycondensation reaction device 1 is 6 cubic meters. The feeding amount of one batch is 2000kg, of which the excess of ethylene glycol is about 150kg. After a batch of polycondensation process to obtain qualified products, the liquid cooled in the low-temperature cooling device is 30kg, and 23kg of acetaldehyde and 7kg of ethylene glycol are separated and analyzed. In polycondensation production, the vacuum degree of the equipment is stable below 10 Pa, and the vacuum degree does not fluctuate.

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Abstract

The invention belongs to the synthesis field of polyester prepared by condensation polymerization, in particular to polycondensation equipment for preparing polydibasic acid glycol ester by condensation polymerization of dibasic acid and dibasic alcohol, especially polyester synthesis equipment with a low-temperature cooling device . Add a bypass pipeline on the pipeline between the conventional cooling device and the vacuum generating device of the general polyester synthesis equipment, and add a low-temperature cooling device in the bypass pipeline, and the low-temperature cooling device is connected with the conventional cooling device and the vacuum through the bypass pipeline respectively Generator; or directly add a low-temperature cooling device on the pipeline between the conventional cooling device and the vacuum generator. Adding a low-temperature cooling device to the polycondensation vacuum pipeline of general-purpose polyester synthesis equipment can reduce the corrosion and influence of the vacuum entrainment gas on the vacuum generator during the polyester polycondensation process, improve the vacuum degree of the polyester polycondensation kettle, and cool down in the low-temperature cooling device. The gas can be recycled and separated to reduce environmental pollution.

Description

Technical field [0001] The invention belongs to the field of synthesis of polyester prepared by condensation polymerization, in particular to polycondensation equipment for preparing polydibasic acid glycol ester by condensation polymerization of dibasic acid and diol, in particular to a polyester synthesis equipment with a low-temperature cooling device . Background technique [0002] In the synthesis process of preparing dibasic acid diol polyester by condensation polymerization of dibasic acid and diol, high vacuum is required to extract low molecular substances produced during the polymerization process during the polycondensation stage. During this process, a large number of small molecule products, a small amount of glycols and oligomers are entrained in the vacuum pumped gas. If these materials are not processed before the vacuum generating device and enter the vacuum pump with the pumped gas, they will definitely affect the vacuum generation. The operation of the device c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78
Inventor 黄曦辰季君晖孟晋生田永生
Owner BEIJING HAIKE HUACHANG NEW MATERIAL TECH
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