Method for reclaiming byproduct sodium chloride in production of epoxy resin
A technology of epoxy resin and sodium chloride, which is applied in the direction of alkali metal chloride, etc., can solve the problems of uneconomical production, high heat energy consumption, and large amount of salt foot, and achieve low equipment requirements, environmental protection, and low energy consumption Effect
Inactive Publication Date: 2008-09-10
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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Problems solved by technology
[0010] However, the above-mentioned various methods are no longer suitable for the needs of modern production. In order to save resources and protect the environment, some researchers have done the following research:
[0011] Qiu Peng introduced in the journal (Chemical Technology Economics, 2004, 22(8), 42-44, 47) that the separated salt saturated liquid is evaporated and concentrated to obtain crystallization, which can be sold as industrial salt, but this method consumes a lot of heat energy ;
[0012] The process introduced by Si Jing in the journal (Anhui Chemical Industry, 2003, (1), 42-44) (salt slag is washed with recycled toluene for many times, separated by automatic vacuum centrifuge, and toluene is removed by vacuum rake dryer) is met. NaCl required by the chlor-alkali industry, but the process and equipment are complex
[0013] The above two methods are suitable for the production of 10,000-ton E-type epoxy resin. Because of the large amount of salt, the water-soluble method is used to recover NaCl in the salt. It is necessary to invest in a set of vacuum salt-making equipment to produce industrial salt products. The profit and loss point of E-type epoxy resin production, but for general manufacturers who only have thousand-ton E-type epoxy resin production equipment, they cannot balance the production profit and loss point, and the production is uneconomical. If all emissions are in violation of the provisions of the Environmental Protection Law
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[0028] Embodiment: technological process of the present invention:
[0029] Add 50kg of clean water into a 1001 volume stirred tank, start stirring, the stirring speed is 80-100 rpm, add 35kg of by-product salt from the production of E-type epoxy resin to prepare a supersaturated brine solution, after the addition is complete, then Add 3kg of 10% hydrochloric acid, after 30 minutes of washing, stop stirring, let it stand for 5-10 minutes, the upper layer of the pickling tank is waste resin and bisphenol A, after cleaning the upper layer of waste resin and other solid impurities, the saturated The brine is removed to the pickling liquid recovery tank, and 35-40% sodium hydroxide is added to adjust the pH of the solution to be 7-8, and sodium chloride precipitates are produced in the solution, and then the light yellow-green sodium chloride precipitate in the brine solution is separated, wherein , The remaining clear liquid after separating out the sodium chloride precipitation ...
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The invention discloses a byproduct NaCl recycling method in the epoxide resin manufacturing course, which comprises the following steps: allocating over-saturated salt solution; acidifying; sedimenting the separated NaCl solution; watering; separating; evolving solid NaCl. The invention improves recycling rate by over 98 percent, which is benefit to protect environment.
Description
technical field [0001] The present invention relates to a kind of method of reclaiming the by-product NaCl of epoxy resin production process, more precisely, relate to a kind of with NaOH as catalyst, with bisphenol A and epichlorohydrin as main raw material, with toluene (or benzene, dichlorohydrin) Toluene, etc.) is the recovery method of the by-product sodium chloride in the production of bisphenol A type (ie E type) epoxy resin process by extraction solvent. Background technique [0002] Because the general-purpose E-type epoxy resin cured product has the characteristics of high mechanical properties, excellent bonding performance, small curing shrinkage, manufacturability, electrical properties, and good stability, among thermosetting resins, epoxy resin and its curing The overall performance of the material is the best. [0003] Epoxy resin and its cured products are mainly used in coatings, adhesives, electronic and electrical materials, engineering plastics and comp...
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IPC IPC(8): C01D3/04
Inventor 何炯
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD