Three-stage evaporation system for recovering dicarboxylic acid from adipic acid waste liquid
A dicarboxylic acid, stage evaporation technology, applied in the separation/purification of carboxylic acid compounds, evaporation, evaporator accessories, etc. Application restrictions, etc.
Inactive Publication Date: 2021-03-05
河南久圣化工有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to solve the shortcomings in the prior art that nitric acid and moisture cannot be removed and recovered well, and the recovery quality of dicarboxylic acid is low, resulting in limited application. Three-stage evaporation system for recovering dicarboxylic acid from adipic acid waste liquid
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[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or there can also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it may be set directly on the other component or t...
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The invention discloses a three-stage evaporation system for recovering dicarboxylic acid from adipic acid waste liquid. The three-stage evaporation system comprises a rising-film evaporator and a falling-film evaporator, wherein a liquid inlet pipe is arranged at the bottom end of the rising-film evaporator; one side of the liquid inlet pipe is connected with a liquid inlet valve through a bolt;collecting pipes are welded to one side of the rising-film evaporator and one side of the falling-film evaporator; a first-stage steam condensate collecting tank and a second-stage steam condensate collecting tank are arranged at the ends of the two collecting pipes correspondingly; a communicating pipe is welded to one side of the rising-film evaporator; the end, away from the rising-film evaporator, of the communicating pipe is welded to one side of the falling-film evaporator; a connecting pipe is arranged on one side of the rising-film evaporator; a condenser is arranged at the end of theconnecting pipe; and one side of the condenser communicates with the condenser. According to the invention, an aqueous dicarboxylic acid solution passes through the rising-film evaporator, the falling-film evaporator, a main three-stage evaporation tank and an auxiliary three-stage evaporation tank, nitric acid and water are evaporated and condensed under a negative-pressure working condition, andthen nitric acid condensate is collected into a nitric acid condensate recovery tank for comprehensive utilization.
Description
technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a three-stage evaporation system for recovering dicarboxylic acid from adipic acid waste liquid. Background technique [0002] The waste liquid produced in the production process of adipic acid plant contains mixed dicarboxylic acid, which is a mixture of succinic acid, glutaric acid and adipic acid, commonly known as nylon acid, or dicarboxylic acid for short. In addition, it also contains a small amount of nitric acid and water, collectively referred to as dibasic carboxylic acid aqueous solution, which is mainly used in the production of solvents, plasticizers, raw materials for the manufacture of pesticides, plant growth hormones and foam plastics, and can also be used to produce dibasic acid dimethyl ester. [0003] In the process of recovering dicarboxylic acid from adipic acid waste liquid, some equipment cannot remove and recover nitric acid and water well, and...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01D1/22B01D1/30C07C51/43C07C55/10C07C55/12C07C55/14
CPCB01D1/22B01D1/30C07C51/43C07C55/10C07C55/12C07C55/14
Inventor 刘水侠马帅曲超屈建海陈亚春张朝领王社志司松凡薛继平张东魏森英华东旭吴化林胡引龙谭钧源
Owner 河南久圣化工有限公司