Production method for decomposing sodium phenolate by using liquid carbon dioxide and coproducing sodium carbonate
A liquid carbon dioxide and production method technology, which is applied in the field of deep processing of high-temperature coal tar and medium-low temperature coal tar, and can solve problems such as exhaust gas pollution, difficult disposal of waste liquid, and equipment corrosion
Active Publication Date: 2017-03-15
山西永东化工股份有限公司
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Problems solved by technology
The method uses liquid pure CO 2 (Industrial grade) Decompose phenol sodium salt to produce crude phenol, solve the problems of equipment corrosion, waste liquid difficult to handle, tail gas pollution and other problems existing in the existing phenol sodium salt decomposition operation, and at the same time recover the waste liquid to produce sodium carbonate, realizing a comprehensive purpose of use
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[0024] specific implementation plan
[0025] Attached below figure 1 Specific embodiments of the present invention will be described in detail. refer to figure 1 Shown, the production technology that liquid carbon dioxide decomposes sodium phenate and coproduces sodium carbonate specifically comprises the steps:
[0026] (1) The sodium phenate salt at 50°C-70°C delivered by the coal tar processing and refining unit enters the upper part of the primary decomposition tower, and flows downward while being mixed with rising CO 2 Contact, the temperature at the bottom of the primary decomposition tower is 75°C-80°C; the sodium phenate salt that has undergone primary decomposition is transported from the bottom of the primary decomposition tower to the upper part of the secondary decomposition tower, and flows downward while being mixed with rising CO 2 Contact, the temperature at the bottom of the secondary decomposition tower is 80°C-85°C;
[0027] (2) The sodium phenate salt ...
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The invention discloses a production method for decomposing sodium phenolate by using liquid carbon dioxide and coproducing sodium carbonate, and aims to solve the problems of equipment corrosion and difficult waste liquid disposal. The production method comprises the following steps: the sodium phenolate is conveyed to the upper part of a primary decomposing tower, then flows into the bottom of the tower after reverse contact with CO2, and then flows into the bottom of a secondary decomposing tower after reverse contact with CO2; one path of the material at the bottom of the secondary decomposing tower enters a decomposed jet mixer and returns to the bottom of the secondary decomposing tower after being mixed with CO2, and unreacted CO2 goes up to the top of the tower; the other path of the material at the bottom of the secondary decomposing tower enters the upper part of an acidifying tower and flows into the bottom of the acidifying tower after reverse contact with CO2; fresh CO2 enters the bottom of the acidifying tower and is thoroughly mixed with the material; one path of the material at the bottom of the acidifying tower enters an acidified jet mixer and returns to the bottom of the acidifying tower after being mixed with CO2, and unreacted CO2 goes up to the top of the tower; the other path of the material at the bottom of the acidifying tower enters a three-phase separator; the interface between crude phenol and an aqueous Na2CO3 solution in the three-phase separator is regulated by using an interface regulator, and after the crude phenol and Na2CO3 are separated, the crude phenol and Na2CO3 flow into respective storage tanks; evaporative concentration, centrifugal separation and drying are performed on the separated aqueous Na2CO3 solution to obtain the finished Na2CO3 product.
Description
technical field [0001] The invention belongs to the technical field of deep processing of high-temperature coal tar and medium-low temperature coal tar, and relates to liquid pure CO 2 (Industrial grade) The production technology of decomposing sodium phenate to produce crude phenol (a mixture of phenol, cresol, and xylenol) and co-producing sodium carbonate. Background technique [0002] The extraction of phenolic substances in high-temperature coal tar and medium-low temperature coal tar generally adopts distillation to obtain phenolic oil fractions with relatively concentrated phenols, and then washes the fractions with NaOH aqueous solution to separate phenolic substances, and first obtains the intermediate product sodium salt of phenol Solution (this process is also called washing process), and then crude phenol is obtained by acid hydrolysis of phenol sodium salt (this process is also called decomposition process). At present, the production of crude phenol mainly use...
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IPC IPC(8): C07C39/04C07C39/07C07C37/00C01D7/00
CPCC01D7/00C07C37/007C07C39/04C07C39/07
Inventor 苏国贤李玉财
Owner 山西永东化工股份有限公司