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Method for comprehensively utilizing solid waste in methyl carbonate production

A technology for dimethyl carbonate and solid waste, applied in alkali metal carbonates, chemical instruments and methods, alkali metal carbonates to change crystal water content, etc., to achieve good benefits, eliminate pollution, and save energy

Inactive Publication Date: 2010-03-17
张青
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The present invention aims at overcoming the shortcoming of the processing method of solid waste in the existing dimethyl carbonate production, and provides a new method for processing solid waste in the production of dimethyl carbonate

Method used

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Examples

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Embodiment

[0009] Add solvent (methanol or ethanol) to the solid waste residue, stir and mix for 30 minutes at a volume ratio of 1:1.5, and filter and separate to obtain an organic phase solution and a sodium carbonate solid phase containing crystal water. The organic phase is distilled at atmospheric pressure, and the temperature is controlled to be lower than 70 degrees Celsius, so that the solvent can be recycled and reused. After completion, the organic matter is pumped back to the large-scale production distillation system for vacuum distillation, so as to obtain dimethyl carbonate (5%), 1,2 - Propylene glycol (85%) and 1% ice carbon (based on organic phase). The solid phase is roasted, and the sodium carbonate containing crystal water contains part of the solvent at the same time, so the roasting process does not need to add any fuel, and the heat of solvent combustion can volatilize the crystal water to obtain sodium carbonate (industrial use).

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Abstract

The invention discloses a method for comprehensively utilizing solid waste in the methyl carbonate production, comprising the following steps: adding solvent in the solid waste, stirring and evenly mixing the mixture according to the volume ratio of 1:1.5; carrying out filter pressing separation to obtain organic phase solution and sodium carbonate solidoid substance containing crystallization water; distillating the organic phase solution at normal pressure under the condition that the temperature is lower than 70 DEG C to reclaim the solvent and simultaneously obtain about 40 percent of organic phase solution relative to the weight of waste residue; carrying out vacuum distillation on organic matters to obtain 5 percent of methyl carbonate relative to the organic phase, which is more than 85 percent of 1,2-propanediol and 1 percent of ice carbon; and baking the solidoid substance to volatilize to obtain 50 percent of industrial sodium carbonate relative to the weight of solid waste residue. The method overcomes the defects that the prior method causes the environment pollution and influences the safe running of a boiler, sodium carbonate, propanediol and methyl carbonate in the waste are burnt out and cannot be recovered so as to cause waste. The method can energy sources and change wastes into valuables.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment of chemical wastes, in particular to a treatment method for solid wastes in the production of dimethyl carbonate. Background technique [0002] Using propylene oxide and carbon dioxide as raw materials to produce dimethyl carbonate large-scale production equipment through the esterification process has been put into operation in various parts of the country and achieved good economic benefits. This production process co-produces 1,2-propanediol at the same time, and part of the solid waste of sodium carbonate (Na2CO3) is produced as a by-product, which is about 1 / 20 of the product output. The main components are sodium carbonate (Na2CO3 5H2O) containing crystal water and organic matter. Containing 1,2-propanediol <85%, dimethyl carbonate about 6%, ice carbon about 1% and some low boilers. Existing production enterprises all adopt the method of boiler combustion to de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/37C01D7/28C07C31/20C07C29/80C07C29/76
CPCY02P20/10
Inventor 张青
Owner 张青
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