Preparation method for simply, quickly and safely preparing p-aminoazobenzene salt
An aminoazobenzene salt, fast technology, applied in the field of chemical synthesis, can solve the problems of increasing refrigeration equipment, increasing equipment investment and energy consumption, and achieve the effects of cost saving, oxidation prevention and high operation safety
Pending Publication Date: 2021-04-13
天津百伦斯生物技术有限公司
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- Application Information
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Problems solved by technology
In order to inhibit the translocation, the sodium nitrite solution must be added dropwise at a lower temperature, so the refrigeration equipment must be added in the production process, thereby increasing the investment and energy consumption of the equipment
Method used
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[0025] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.
[0026] The present invention provides a simple, fast and safe preparation method for preparing p-aminoazobenzene salt. The synthesis process is as follows:
[0027]
[0028] Concrete process method steps are as follows:
[0029] 1. Preparation of aniline hydrochloride solution
[0030] Add 4kg of aniline into the reactor, start the stirrer, add 2.4kg of 36% concentrated hydrochloric acid dropwise at room temperature, and prepare the aniline hydrochloride solution for later use.
[0031] 2. In another reactor, add 8kg of aniline, 1.4kg of sodium nitrite and 2kg of water respectively, stir to form a solution, control the temperature at 35±1°C, and add the above-mentioned aniline hydrochloride solution dropwise. After the addition, the tem...
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The invention relates to a preparation method for simply, quickly and safely preparing p-aminoazobenzene salt. The method is scientific and reasonable in design and high in operation safety, and adopts a part of aniline to react with hydrochloric acid firstly, so that concentrated hydrochloric acid is prevented from being directly added into a mixed solution of aniline and sodium nitrite, and potential safety hazards caused by violent reaction are prevented; besides, aniline hydrochloride instead of hydrochloric acid is added, so that generation of a large amount of nitrous acid is avoided, aniline is prevented from being oxidized, and a reaction solution is prevented from becoming black. According to the method, aniline is partially acidified, and then the reaction liquid is dropwise added, so that the reaction can be completely and normally carried out at normal temperature, refrigeration equipment does not need to be added, and lots of expenditures can be saved.
Description
technical field [0001] The invention belongs to the field of chemical synthesis, and relates to a preparation method of p-aminoazobenzene salt, in particular to a simple, fast and safe preparation method of p-aminoazobenzene salt. Background technique [0002] P-aminoazobenzene hydrochloride is a columnar crystal, slightly soluble in water, soluble in hydrochloric acid, ethanol, ether, chloroform, and benzene, is an intermediate of azo dyes, and has been widely used in the production of acid dyes and disperse dyes Production. With the rapid development of science and technology, p-aminoazobenzene hydrochloride, especially the reagent grade, is more and more widely used. It can be used not only as an acid-base indicator, but also for the determination of nitrite, sulfite in water and beverages, methanol and formaldehyde in air, water, and blood. [0003] The preparation method of p-aminoazobenzene salt in the prior art is to first add sodium nitrite aqueous solution and exc...
Claims
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IPC IPC(8): C07C245/08C07C245/24C07C209/74C07C211/46
CPCC07C245/08C07C245/24C07C209/74C07C211/46
Inventor 赵鹏齐帅杜晓彤
Owner 天津百伦斯生物技术有限公司