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Method for removing organic matter and carbon dioxide from exhaust gas in the process of producing carbonate with carbon dioxide and fatty alcohol

A technology of carbon dioxide and carbonate, applied in the direction of carbon dioxide or inorganic carbonate preparation, etc., can solve problems such as clogging pipes and hindering ammonia condensation, and achieve the effects of small device investment, significant benefits, and simple process technology

Active Publication Date: 2014-10-01
HUALU ENG & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

If there is residual carbon dioxide in the tail gas recovery ammonia, then in the condensation process, these carbon dioxide will inevitably react with ammonia to form ammonium carbamate, etc., and its crystallization will block the pipeline and hinder the condensation of ammonia

Method used

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  • Method for removing organic matter and carbon dioxide from exhaust gas in the process of producing carbonate with carbon dioxide and fatty alcohol
  • Method for removing organic matter and carbon dioxide from exhaust gas in the process of producing carbonate with carbon dioxide and fatty alcohol

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Embodiment Construction

[0029] The following combination figure 1 with figure 2 , the process flow of the present invention is further described.

[0030] Such as figure 1 As shown, after the raw material fatty alcohol and urine are mixed, they enter the carbonate synthesis unit to obtain carbonate products. The synthesis tail gas enters the tail gas recovery system and is absorbed by the concentrated ammonia water from the urea recovery unit to obtain clean ammonia gas, which enters the ammonia absorption system. device 7, such as figure 2 As shown, it is absorbed by the lean liquid (aqueous solution with low ammonia concentration) from the downstream. The operating temperature of the absorption is controlled by circulating cooling water, generally 37-45°C. The absorption pressure depends on the upstream saturated ammonia pressure. After the absorbed rich liquid (aqueous solution with high ammonia concentration) is pressurized by the booster pump 2, after being heated by the downstream lean liq...

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Abstract

The invention provides a method for removing organic matters and carbon dioxide in tail gas by using carbonic ester produced from carbon dioxide and fatty alcohol. The method comprises the following steps of: mixing raw materials such as methanol with urea; entering a carbonic ester synthesis unit to obtain a carbonic ester product; feeding synthetic tail gas into a tail gas recovery system; removing organic matters and carbon dioxide; and returning an obtained methylamine solution and liquid ammonia into a urea synthesis unit. According to the method, ammonia consumed by synthesizing urea can be completely replenished through a recovery alcoholysis reaction. Raw materials consumed in the method are mainly cheap carbon dioxide, fatty alcohol and the like, a produced product is carbonic ester with high added value, and the method can be applied to industrial production.

Description

technical field [0001] The invention relates to a method for removing organic matter and carbon dioxide in tail gas from industrial products such as dimethyl carbonate, diethyl carbonate, and propylene carbonate by using cheap carbon dioxide and aliphatic alcohol and other raw materials to produce high-value-added carbonates . Background technique [0002] Carbonate compounds have a wide range of uses in industrial production. Because their molecules contain functional groups such as methoxy, carbonyl and carbonylmethyl, they have good reactivity and can replace highly toxic phosgene as carbonylating agents. Dimethyl sulfate (DMS) was used as methylating agent. Therefore, as a green intermediate, it is widely used in the synthesis of pesticides, medicines, and polymers. [0003] At the same time, some carbonate compounds have good compatibility with many organic compounds, and have been used as benzene-substituted solvents in pesticides, paints, and coatings. In addition, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C07C68/04C07C69/96
Inventor 邬慧雄吴莹莹赵秋松屈艳莉
Owner HUALU ENG & TECH
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