Continuous esterification device for preparing terephthalate of dihydric alcohol
A technology of terephthalic acid glycol ester and terephthalic acid, which is applied in the field of continuous esterification reaction device, can solve the problems of increasing logistics power and high molar ratio of feeding materials, and achieve the effect of ideal distribution
Inactive Publication Date: 2004-04-28
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
[0004] The invention provides a new external circulation heating continuous esterification reaction device for preparing diol terephthalate from terephthalic acid and dibasic alcohols, which increases by setting static equipment components in the reactor The dynamics of the logistics in the system, thereby solving the technical problem that the molar ratio of dibasic alcohol and terephthalic acid is too high in the prior art
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[0016] As can be seen from the drawings, the device includes a reactor 1 and an external circulation tube heater 2, and the inlet and outlet of the heat exchanger are connected to the reactor through pipes 3 and 4, respectively. The reaction kettle has a double-chamber structure with inner and outer chambers, the inner chamber 5 is located at the bottom of the kettle, the space outside the inner chamber in the kettle is the outer chamber 6, and the top of the inner chamber is located at nearly 1 / 2 of the height of the kettle. The pipe connection port 7 connecting the reaction kettle to the inlet of the outer circulation tubular heater is located at the bottom of the inner chamber and communicates with the inner chamber; the pipe connection port 8 connecting the reaction kettle to the outlet of the outer circulation tubular heater is located on the side wall of the lower part of the reaction kettle. The outside room is connected.
[0017] The inner chamber is composed of an out...
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The continuous esterification apparatus for preparing terephthalate of dihydric alcohol includes a reactor and an externally circulating shell and tube heater. The reactor has one double-chamber structure including an inner chamber in the bottom of the reactor and an outer chamber. The connecting pipe between the inlet of the externally circulating shell and tube heater and the reactor is led to the inner chamber, the connecting pipe between the outlet of the externally circulating shell and tube heater and the reactor is led to the outer chamber, and the liquid material passage connecting the inner chamber and the outer chamber is one annular one with U-shaped cross section. The material feeding port is at the inlet of the externally circulating shell and tube heater, the liquid reaction product exit is in the bottom of the reactor and led to the inner chamber, and the gas exit is in the top of the reactor. The present invention has lower material throwing ratio between dihydric alcohol and terephthalic acid.
Description
technical field [0001] The invention relates to a continuous esterification reaction device for preparing diol terephthalate from terephthalic acid and dibasic alcohol. Background technique [0002] Polyester mainly includes polyethylene terephthalate, polybutylene terephthalate and polytrimethylene terephthalate. At present, most of its manufacturing processes are direct esterification, that is, terephthalic acid and corresponding diols for direct esterification. The existing polyester production is continuous. Although there are many kinds of process routes, they are basically composed of three continuous processes of esterification, precondensation and polycondensation. The esterification process is at the forefront, so it is The most critical part of the entire process route, it will have a great impact on the operability of the subsequent process and the quality of the final product. The esterification reaction has high requirements on the equipment, it must meet a la...
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Login to View More IPC IPC(8): C07C67/08C07C69/82
Inventor 俞明康汪少朋
Owner CHINA PETROLEUM & CHEM CORP