A device and method for preparing oxalic acid by hydrolysis of oxalic acid ester
A technology of oxalate and oxalic acid, which is applied in hydrolysis preparation, carboxylate/lactone preparation, chemical instruments and methods, etc., can solve the problems of high equipment cost, slow reaction rate, complicated process, etc., and achieve energy saving, The effect of size reduction and load reduction
Active Publication Date: 2021-06-08
FUZHOU UNIV +1
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Problems solved by technology
Although the conversion rate of this method reaches 99%, there are still some deficiencies in this process, which affect its industrial application
First of all, the structure of the next-door reactive distillation tower is complex, not only the equipment cost is high, but also the equipment control is complicated; secondly, the whole process flow is complicated. In addition to the next-door reactive distillation tower, unit processes such as methanol refining tower and light removal tower are also required; Secondly, oxalic acid crystals are obtained by evaporation, concentration and crystallization, and the energy consumption of the system is high; finally, the oxalic acid generated by the reaction is used for autocatalysis, the reaction rate is slow, and the reaction distillation tower equipment is large
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[0029] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.
[0030] Such as figure 1 As shown, a device for preparing oxalic acid by hydrolyzing oxalate esters includes a batching tank 1, a pre-reaction tank 2, a reactive distillation tower 3, a methanol refining tower 4 and a crystallization tank 6 connected to each other through pipelines.
[0031] In the embodiment of the present invention, the upper side of the batching tank 1 is connected with the water inlet and the oxalate ester inlet, the top inlet pipe of the batching tank 1 is connected with the top outlet of the crystallization kettle 6, and the bottom outlet pipe of the batching tank 1 is connected with Next to the upper side inlet of the pre-reaction kettle 2, the bottom outlet of the pre-reaction kettle 2 is connected to the pre-reaction material inlet of t...
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The invention relates to a device for preparing oxalic acid by hydrolysis of oxalate, which comprises a batching tank, a pre-reaction tank, a reactive distillation tower, a methanol refining tower and a crystallization tank connected to each other through pipelines. The invention combines pre-reaction and reactive distillation technology, and utilizes the self-catalysis of oxalic acid to realize high-efficiency hydrolysis of oxalic acid ester through circulation of oxalic acid mother liquor, and obtains high-purity oxalic acid product.
Description
technical field [0001] The invention relates to a device and a preparation method for preparing oxalic acid by hydrolyzing oxalate, belonging to the technical field of oxalate hydrolysis. Background technique [0002] Oxalic acid is an important chemical raw material, widely used in medicine, printing and dyeing and plastic industries. As a precipitant, oxalic acid can also be used to separate and purify rare earth elements. With the rapid development of aerospace, new energy, new materials and other fields, the application fields of oxalic acid are becoming wider and wider, and the demand for oxalic acid is increasing year by year. At present, the preparation methods of oxalic acid mainly include synthesis method and hydrolysis method. The hydrolysis method is to hydrolyze oxalate ester under acidic conditions to obtain oxalic acid. The hydrolysis reaction process of oxalate ester is composed of two steps. Oxalic acid monoester, and then the oxalic acid monoester continue...
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IPC IPC(8): C07C51/09C07C51/43C07C55/06C07C29/09C07C29/80C07C31/04
CPCC07C29/095C07C29/80C07C51/09C07C51/43C07C55/06C07C31/04Y02P20/10
Inventor 邱挺周伟黄智贤刘征王清莲王红星叶长燊王晓达杨臣
Owner FUZHOU UNIV