Process for dechlorinating and refining dimethyl carbonate crude product of gas-phase carbonyl method

A technology of dimethyl carbonate and dimethyl chlorocarbonate, which is applied in the field of chemical technology, can solve the problem of not finding similar technical published patent documents, etc., achieves convenient and efficient daily equipment management and daily operation, saves construction costs, reduces The effect of construction period

Pending Publication Date: 2021-03-09
上海诺哈尔化工技术有限公司
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Problems solved by technology

[0006] Through the search of existing published patent documents,

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  • Process for dechlorinating and refining dimethyl carbonate crude product of gas-phase carbonyl method

Examples

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Example Embodiment

[0046] Example 1

[0047] 10.0M 3 The strong alkaline resin, loading the resin into the resin column; the resin tower structure includes, the cylinder, a liquid distributor connected to the feed port, a support plate, a heat pipe, or the like. Under temperature 60.0 ° C and pressure of 0.1 MPa (g), dimethyl carbonate prepared by gas phase carbonyl method was dichlorinated, and the flow rate was 20000.0 kg / h (there in the oxalate concentration of 58.0%, methyl carbonate The ester concentration was 35.0%, the concentration of methanol 1 was 6.0%, and the other 1.0%) was filtered through a fixed bed B, and the chloride ion concentration bits were 16.0 ppm in front of the crude product. Through the adsorption of the strong alkaline resin, a trace chloride ion remaining in the dialthyl carbonate prepared by gas phase carbonyl is adsorbed, and the chloride ion concentration of 0.8 ppm after filtration is filtered, and dimethylcarbonate. The crude product can be sent to the subsequent ...

Example Embodiment

[0054] Example 2

[0055] 20.0m 3 The strong alkaline resin, loading the resin into the resin column; the resin tower structure includes, the cylinder, a liquid distributor connected to the feed port, a support plate, a heat pipe, or the like. Under temperature of 70.0 ° C and pressure 0.2 MPa (g), dimethyl carbonate prepared by gas phase carbonyl method was dichlorinated, and its flow rate was 25,000.0 kg / h (there in the oxalate concentration of 67.0%, bicarbonate The ester concentration was 28.0%, the methanol 1 concentration was 4.0%, and the other 1.0%) was filtered through a fixed bed B, and the chloride ion concentration bits were 40.0 ppm in front of the crude product. Through the adsorption of the strong alkaline resin, a trace chloride ion remaining in the dialthyl carbonate prepared by gas phase carbonyl is adsorbed, and the chloride concentration of the chloride ion is 1.2 ppm after filtration, and dimethyl carbonate. The crude product can be sent to the subsequent di...

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Abstract

The invention discloses a process for dechlorinating and refining a dimethyl carbonate crude product of a gas-phase carbonyl method, and relates to the field of chemical processes. The process comprises the following steps: weighing a preset amount of adsorbent, and filling the adsorbent into fixed bed equipment; and filtering the dimethyl carbonate crude product prepared by the gas-phase carbonylmethod through a fixed bed according to a preset liquid hourly space velocity at a preset temperature and a preset pressure. The residual trace chloride ions in the dimethyl carbonate crude product prepared by the gas-phase carbonyl method are adsorbed under the action of the adsorbent in the fixed bed, the concentration of the chloride ions in the adsorbed crude product is reduced to 2.0 ppm orbelow, and the purpose of dechlorinating the crude product is achieved, so that the chlorine corrosivity of the crude product is effectively reduced, and the material requirement of a subsequent treatment section is reduced.

Description

Technical field [0001] The present invention belongs to the field of chemical processes, and more particularly to a carbonate cropper-dichloroetchloride of a gas phase carbonyl method. Background technique [0002] The main raw material of dimethyl carbonate is carbonate (CO) and methanol, and the main reaction product is dimethyl carbonate, and the by-product is methyl formate, methicate, oxalate (DMO), and the like. [0003] In order to maintain the reaction activity of the synthetic palladium catalyst during the production, the micro-hydrogen chloride or methyl chloride or methyl chloroformate is required to the reactor. The supplied chloride will be washed in the washing column of the dimethyl carbonate product, and the subsequent treatment system is entered along with the diethylene carbonate crude. [0004] At present, there is a large number of anticorrosive materials, such as glass, ceramics, Haust alloy, graphite, and other materials. However, this not only greatly impro...

Claims

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Application Information

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IPC IPC(8): C07C68/08C07C69/96
CPCC07C68/08C07C69/96
Inventor 汪俊肖招金单文波唐大川倪菁华
Owner 上海诺哈尔化工技术有限公司
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