Synthesis Method Of Dicyclohexylamine-manufacture,factory,supplier from China

The invention relates to a synthesis method of dicyclohexylamine, which comprises the following steps: in a hydrogenation reactor, aniline and hydrogen are hydrogenated in gas phase under the catalyst to obtain DCHA crude product.The replacement reaction was carried out with aniline and DCHA crude product to obtain the replacement mother liquor. The replacement mother liquor was delight and refined, and DCHA product was obtained at the top of the refining tower.

The invention relates to a method for the synthesis of N-chlorinated dicyclohexylamine with low concentration of sodium hypochlorite. The mass of dicyclohexylamine is weighed, and the amount of sodium hypochlorite of low concentration required for the reaction is calculated according to the molar ratio of dicyclohexylamine and sodium hypochlorite =1:1.051.20. Put dicyclohexylamine into the reactor, and keep the reactor temperature.

The invention relates to a tail gas refining method, especially a method for hydrogenation of aniline to produce dicyclohexylamine tail gas deamination and hydrogen refining, which belongs to the technical field of chemical industry.

At present, there are two main synthesis methods of trichlorosilane: one is the traditional synthesis method, that is the silicon chloride method. The other is hydrolyzation of tetrachloride. At present, the mainstream method of polysilicon production is the modified Siemens method, using trichlorosilane reduction method. In recent years, with the continuous decline of polysilicon price, polysilicon production enterprises pay more and more attention to the control of production cost.

At present, there are few reports on the quantitative analysis of dicyclohexylamine and impurities, so it is necessary to study them separately accurate quantitative analysis method. Since dicyclohexylamine has no ultraviolet absorption, the quantitative analysis method of dicyclohexylamine by high performance liquid chromatography evaporative light scattering detector was studied. 

The invention relates to a refining method of dicyclohexylamine, belonging to the technical field of organic chemistry.

The process relates to a tail gas refining method, in particular to the hydrogenation of aniline to prepare cyclohexylamine and the deamination of dicyclohexylamine tail gas to refine hydrogen.

The invention uses nitro-benzene and hydrogen as raw materials. Adding solvent, nitro-benzene and catalyst into the reaction kettle, controlling the reaction pressure of 0.5 ~ 4MPa, reaction temperature of 60 ~ 160℃, reaction for 2 ~ 8h, cyclohexylamine and dicyclohexylamine are obtained, and the catalyst used is Pd/CNTs catalyst or PD-Ni /CNTs catalyst. 

Silicon tetrachloride is an important raw material and intermediate product in the process of organic silicon synthesis and polysilicon production. Under different environmental conditions, silicon tetrachloride can react with a variety of substances to produce new substances.

Nitrocyclohexane reduction method: This method takes nitrocyclohexane and hydrogen as raw materials, using reducing agent to generate cyclohexylamine, because nitrocyclohexane raw materials are difficult to obtain, this method is basically eliminated. Moreover, the process has some defects, such as low one-way conversion of aniline and poor selectivity of dicyclohexylamine.

Dicyclohexylamine has the chemical properties of a secondary amine. It has a strong base and can form salts with various acids. Acylation may occur. In terms of solubility, dicyclohexylamine is slightly soluble in cold water but almost insoluble in hot water. Dry powder, carbon dioxide, soluble foam and sand are used to extinguish the fire.

The purity of dicyclohexylamine is better than 99.five%, that is 99% higher than the standard of peer organizations. recycling the economic chain can lessen the comprehensive value of the manufacturing facility. there are 3 aniline factories in dongying, shandong, huai 'an, jiangsu and tianji, shanxi within four hundred kilometers. the generation is mature, and the people have about twenty years of practical enjoy.

A vapor phase corrosion inhibitor preparation method, including the following steps :a. Dispersing montmorillonite in deionized water, beating, stirring, and then taking the suspension of the solution to add morpholine, heating the solution to evaporate and precipitate crystals.b. Add formaldehyde to the solution in Step a and let it stand; add dicyclohexylamine and let it stand; then add the mixed solution of benzoic acid and acetone to the solution and let it stand to generate white slurry.

Cyclohexanol gas-phase ammoniation method: it is the liquid hydrogenation of cyclohexanol and ammonia to cyclohexanamine and dicyclohexanamine under the action of nickel/silica catalyst. The yield of cyclohexanol and dicyclohexanamine is 3:1, and the conversion rate of cyclohexanol is about 70%, which has not been reported in industrialization in China.

The purity of dicyclohexylamine is higher than ninety nine.5%, that is 99% better than the same old of peer groups. recycling the economic chain can lessen the comprehensive price of the producing facility. there are three aniline factories in dongying, shandong, huai 'an, jiangsu and tianji, shanxi within four hundred kilometers. the era is mature, and the people have about 20 years of practical enjoy.

The method of species co-production of cyclohexylamine and dicyclohexylamine and the catalyst system used for the method. The method includes the following steps :(1) the raw material aniline, cyclohexanone, ammonia, hydrogen after the loading load RhNi catalyst first section reactor, the first reaction liquid.(2) The reaction solution containing cyclohexylamine and dicyclohexylamine was obtained through the second stage reactor loaded with RhCo catalyst.

The purity of dicyclohexylamine is higher than 99.5%, which is 99% higher than the standard of peer enterprises. Recycling the industrial chain can reduce the comprehensive cost of the factory. There are three aniline factories in Dongying, Shandong, Huai 'an, Jiangsu and Tianji, Shanxi within 400 kilometers. The technology is mature, and the workers have about twenty years of practical experience. Stable supply, with an annual output of 36,000 tons, of which dicyclohexylamine has an annual output of 12,000 tons.

The purity of dicyclohexylamine is better than ninety nine.5%, this is 99% higher than the identical old of peer companies. recycling the economic chain can reduce the complete fee of the manufacturing facility. there are 3 aniline factories in dongying, shandong, huai 'an, jiangsu and tianji, shanxi within 4 hundred kilometers. the technology is mature, and the human beings have approximately twenty years of realistic experience.

DCHA at home and abroad is usually a by-product of CHA production. In the process of CHA synthesis by aniline hydrogenation, about 10% of DCHA can be obtained by by-product. In addition, according to the different catalysts, the yield of DCHA prepared by aniline hydrogenation can reach up to 70%, and the yield of cyclohexylamine (CHA) is 30%.Benzene, cyclohexane, cyclohexanol, N-cyclohexylcyclohexamine, phenylcyclohexylamine and other by-products will be generated in the reaction.

A method of cyclohexylamine catalytic production of biodiesel with prickly ash seed oil as raw material is described as follows: prickly ash seed oil is mixed with methanol and the catalyst cyclohexylamine.

At present, amine salt type corrosion inhibitors are widely used and have superior effects. Through physical and chemical analysis of the sample, ultraviolet spectrum, infrared spectrum, nuclear magnetic resonance spectroscopy and ion chromatography and other series of analysis and  prediction to determine the role of different ions of dicyclohexylamine salt corrosion inhibitor in steel corrosion analysis, and finally determined that the solid sample may be dicyclohexylamine nitrite. 

Foreign production and application are mainly concentrated in the western developed countries and regions, the main manufacturers are the United States Air Products company, Celanes company, Germany BASF, Bayer company and other scale manufacturers. But in Europe, cyclohexylamine has been in short supply due to the limitation of hydrogen feedstock. With the rapid development of the food additive cyclamate and rubber industry, the consumption of cyclohexylamine has been increasing at an average annual rate of more than 10%.

It is obtained by catalytic hydrogenation of aniline and can be divided into atmospheric pressure method and pressure method. In addition, cyclohexamine can be prepared by catalytic ammonolysis of cyclohexane or cyclohexanol, reduction of nitrocyclohexane, and catalytic ammonolysis of cyclohexanone in the presence of hydrogen.The refining process often contains impurities such as aniline and water.

In silicon tetrachloride purification, boron is the most difficult impurity to remove. Researchers have proposed compound method to remove boron from silicon tetrachloride, which has achieved satisfactory results and has been widely used in industrial production.