A method for co-producing benzoic acid, p-toluic acid and m-toluic acid

A technology of p-toluic acid and toluic acid is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc. Large, high production costs, to achieve the effects of low prices, diversified product structure, and less investment in equipment

Active Publication Date: 2020-11-17
山东友道化学有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Its object of the present invention just is to provide a kind of method of co-production benzoic acid, p-toluic acid and m-toluic acid, solves the problem that there is not wide source of raw materials required for production, high production cost and mixed secondary The problem of large differences in the oxidation rate of toluene

Method used

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  • A method for co-producing benzoic acid, p-toluic acid and m-toluic acid
  • A method for co-producing benzoic acid, p-toluic acid and m-toluic acid
  • A method for co-producing benzoic acid, p-toluic acid and m-toluic acid

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Experimental program
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Effect test

Embodiment 1

[0071] The fresh xylene added to the system is 91.4g, and the mass composition of xylene is ethylbenzene: p-xylene: m-xylene=45:50:5, and the dissolved catalyst is N -Hydroxyphthalimide, metallophthalocyanine (R) with general formula (IV) structure 1 =OH,R 2 =H, M=Ru), metalloporphyrins with general formula (III) structure (R 1 =R 3 = H, R 2 =OH,M 1 = M 2 =Mn) and cobalt naphthenate, the total concentration is 10000ppm. After the system circulation was stabilized, the mass of the oxidation reaction solution added in circulation was 488.6 g. The pressurized pure oxygen is continuously passed into the oxidation reaction kettle, the reaction temperature of the system is maintained at 130°C, the reaction pressure is 0.2MPa, and the reaction time is 3.2 hours. The implementation effect is that the conversion rate of xylene is more than 99.9%, the selectivity of each target product is more than 99%, the yield of benzoic acid is 97.8%, the yield of m-toluic acid is 90.2%, p-to...

Embodiment 2

[0073] The fresh xylene added to the system is 66.9g, and the mass composition of xylene is ethylbenzene:p-xylene:m-xylene=25:25:50, and the dissolved catalyst is Ni(Ac) 2 , N,N',N'' - trihydroxyisocyanuric acid, metallophthalocyanine (R) with general formula (IV) structure 1 = H, R 2 =Cl, M=Zn) and metalloporphyrins (R 1 =R 2 =CH 3 CH 2 , R 3 =H, M=Fe, X=Br), the total concentration is 420ppm. After the system circulation was stabilized, the mass of the oxidation reaction liquid added in circulation was 513.1 g. The pressurized pure oxygen is continuously fed into the oxidation reaction kettle, the reaction temperature of the system is maintained at 125°C, the reaction pressure is 0.6MPa, and the reaction time is 1.5 hours. The implementation effect is that the conversion rate of xylene is more than 99.9%, the selectivity of each target product is more than 99%, the yield of benzoic acid is 98.1%, the yield of m-toluic acid is 93.4%, p-toluic acid The yield was 95.1...

Embodiment 3

[0075] The fresh xylene added to the system is 169.2g, and the mass composition of xylene is ethylbenzene:p-xylene:m-xylene=20:30:50, and the dissolved catalyst is Mn(Ac) 2· 4H 2 O, metal phthalocyanine (R) with general formula (IV) structure 1 =NO 2 , R 2 =H, M=Co), metalloporphyrins with the structure of general formula (I) (R 1 =R 3 = H, R 2 =CH 3 CH 2 , M=Cu) mixture, the total concentration is 120ppm. After the system circulation was stabilized, the mass of the oxidation reaction liquid added in circulation was 410.8 g. The pressurized pure oxygen is continuously passed into the oxidation reaction kettle, the reaction temperature of the system is maintained at 175°C, the reaction pressure is 0.7MPa, and the reaction time is 1.5 hours. The implementation effect is that the conversion rate of xylene is more than 99.9%, the selectivity of each target product is more than 99%, the yield of benzoic acid is 96.5%, the yield of m-toluic acid is 93.0%, p-toluic acid The...

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Abstract

The invention discloses a method for co-producing benzoic acid, p-toluylic acid and m-methylbenzoate. The method comprises the following steps of (1) oxidizing: adding a xylene mixture, a catalyst and an oxygen-containing gas into an oxidation reactor to react, wherein the content of oxygen in the oxygen-containing gas in percentage by mass is no less than 15%; (2) gas and liquid separating and purifying: sending an oxidation reaction liquid into a gas and liquid separator, condensing and separating a gas phase part, circulating the condensate into the oxidation reaction liquid to continue to oxide, treating and exhausting the non-condensing gas, and performing conventional rectification on a liquid phase part, so as to obtain a low-boiling point component of which the boiling point is lower than the boiling point of benzoic acid; circulating into the oxidation reactor to continue to oxide, and performing further conventional rectification on the tower bottom component, so as to sequentially obtain the benzoic acid, m-methylbenzoate and p-toluylic acid products. The method has the advantages that the technology is simple, the cost of raw material is low, the equipment investment is little, the yield rate is high, the selectivity is good, and the economic benefit is good.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a method for co-producing benzoic acid, p-toluic acid and m-toluic acid. [0002] technical background [0003] Benzoic acid is an important bulk organic chemical raw material. It is used in the chemical industry to produce chemical products such as benzyl benzoate, methyl benzoate, and ethyl benzoate. It is used in medicine to produce drugs such as chorionicin. It is used in the synthetic resin industry. It is used in the production of alkyd resin, polyamide resin, etc., and is widely used as a preservative in the food industry. Its preparation method is mainly toluene air oxidation. [0004] Toluic acid is also an important bulk organic chemical raw material and can be used as an intermediate for medicine, pesticides, organic pigments and brighteners. Its preparation methods mainly include xylene nitric acid oxidation, xylene air oxidation, toluene carbonylation- Oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/215C07C51/42C07C51/44C07C63/06C07C63/04
CPCC07C51/215C07C51/42C07C51/44C07C63/06C07C63/04
Inventor 王勤波刘建明周锡妹曹金辉张斌宗匡
Owner 山东友道化学有限公司
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