Preparation process of dimethyl succinate
A technology of dimethyl succinate and preparation process, which is applied in the preparation of carboxylate, the preparation of carboxylic anhydride, the preparation of organic compounds, etc., can solve the problem that intermediate products are prone to impurities, the content of impurities in products increases, and the impact on product quality, etc. problems, to achieve the effect of low cost, reduce the generation of impurities, and improve efficiency
Inactive Publication Date: 2018-12-11
南京雪郎化工科技有限公司
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Problems solved by technology
[0003] However, the existing dimethyl succinate has a complex process, and the intermediate product is prone to impurities, which are not easy to be clear. At the same time, the traditional production method increases the impurity content of the product, and the quality of the final product is greatly affected by impurities.
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[0018] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are listed herewith, and are described in detail as follows.
[0019] A kind of preparation technology of dimethyl succinate of the present invention comprises the following steps:
[0020] Step 1: Add maleic anhydride and desalted water into the batching tank, mix and stir, and perform hydrolysis reaction to obtain maleic acid.
[0021] Step 2: Put the maleic acid in step 1 into the electrolyte storage tank, add sulfuric acid into the electrolyte storage tank at the same time for mixing, and use a stirrer to fully mix to form an electrolyte; the reaction equation is as follows:
[0022]
[0023] Step 3: Discharge the electrolyte in step 2 into the electrolytic cell for electrolysis according to the usage requirements, and make maleic acid react with hydrogen ions generated by electrolyzed water through the action of electrodes to generat...
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Abstract
The invention relates to a preparation process of dimethyl succinate. Maleic anhydride and desalted water are hydrolyzed initially through optimization of technological conditions, and then electrolyte is prepared to hydrolyze in an electrolytic tank, so that the dehydration efficiency is improved greatly, the chemical reaction quality is ensured, and the generation of impurities can be reduced effectively. Through electrolysis in the electrolytic tank as well as sequential treatment through an electrolyte treatment device, a cooling crystallizer and a centrifugal separator, high-purity succinic acid can be obtained. Dimethyl succinate can be prepared directly through succinic acid and methanol under the action of a catalyst. The whole process flow is simple, and the cost is low.
Description
technical field [0001] The invention belongs to the technical field of dimethyl succinate production, in particular to a preparation process of dimethyl succinate. Background technique [0002] Dimethyl Succinate, also known as Dimethyl Succinate. The CAS number is 106-65-0, the molecular formula is C4H10O4, and the molecular weight is 146.14. It is generally a colorless crystal or liquid, with a melting point of 19°C, a boiling point of 196.4°C, a flash point of 90°C, a specific gravity of 1.1198, and a refractive index of 1.4197. It is easily soluble in ether, Organic solvents such as methanol, ethanol and acetone, slightly soluble in water. Widely used in food, spices, daily chemicals, pharmaceuticals, coatings, rubber, plastics and other industries, used in the synthesis of light stabilizers, high-grade coatings, fungicides, pharmaceutical intermediates, is an important chemical intermediate, widely used in Raw material for various chemicals. [0003] However, the exi...
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IPC IPC(8): C07C67/08C07C69/40C25B3/04C25B3/25
CPCC07C51/087C07C67/08C25B3/25
Inventor 李云政张磊
Owner 南京雪郎化工科技有限公司