A Method For Synthesis Of CHA & DCHA From Nitrobenzene-manufacture,factory,supplier from China

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. 

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.

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.

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 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.

Cyclohexylamine (CHA) is a primary amine, can be miscible with water with infinite ratio, the molecule is small, easy to adsorb on the metal surface, its shielding effect is better than long chain primary amine and secondary amine, so it can effectively prevent the invasion of corrosive ions, thereby improving corrosion resistance, especially the ability to inhibit corrosion.The corrosion inhibition of 304 stainless steel by cyclohexylamine in sodium chloride medium was studied in detail.

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.

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.

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.

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.

The mixture of trichlorosilane and polysilicon, which is a by-product of the recombination from the bottom of the distillation column in the production of trichlorosilane and polysilicon, was used as raw material to prepare silica by gas phase hydrolysis. The effects of gasification temperature, flow rate and flow ratio of water vapor and chlorosilane mixture on physicochemical properties of the products were investigated.

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.

To explore the application value of ion chromatography in the detection of cyclohexylamine in workplace air. Workplaces containing cyclohexylamine in the production of raw materials were selected as sampling sites, and the content of cyclohexylamine in workplaces was detected by ion chromatography. At the same time, the precision and recovery rate of ion chromatography, desorption efficiency, sampling efficiency and other cation interference characteristics were analyzed.

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.

It is obtained by catalytic reduction of nickel or cobalt from aniline at high temperature and pressure. Cyclohexanol can also be reduced by phenol, oxidized to cyclohexanone, and then aminated with ammonia to obtain cyclohexanamine.This substance is harmful to the environment, and special attention should be paid to the pollution of water bodies. Acute poisoning may occur by inhalation of vapour. Irritant and corrosive to skin, eyes and mucous membranes, and can cause allergy through skin absorption.

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. 

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

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.

With the rapid growth of downstream PV demand, photovoltaic grade trichlorosilane continues to be in short supply. The application of PV grade trichlorosilane in the production of polysilicon includes a one-time requirement for the first commissioning, which accounts for about 20% of the total capacity. Second, the requirement for chlorine supplementation during continuous production accounts for about 10 to 30 percent of total production. On the supply side, the expansion of trichlorosilane production has been conservative in the past.

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. 

Cyclohexylamine, an organic compound with the chemical components of c6h13n, is a drab to yellow liquid, soluble in water and miscible in most organic solvents. It is mainly used as a solvent, and can also be used to prepare desulfurizer, rubber antioxidant, vulcanization accelerator (CZ), cyclamate, medical raw materials, chemical additives for plastics and textiles, boiler feed water treatment agent, metal corrosion inhibitor, emulsifier, preservative, antistatic agent and latex coagulant. 

High temperature hydrogenation of silicon tetrachloride is an important method to treat silicon tetrachloride as a by-product of polysilicon. High temperature hydrogenation is silicon tetrachloride and hydrogen as raw materials, heated by 1200 ~ 1250℃ graphite heater, thermal reduction reaction to produce  trichlorosilane. The advantages of the process are that the whole system is closed circulation, suitable for continuous and stable operation; Trichlorosilane products of high purity, need to distillation links less.

SiCl4 is one of the most important inorganic silicon compounds, is a colorless, transparent, flowing smoke liquid, with suffocating odor, soluble in benzene, ether, chloroform and other most organic solvents. Silicon tetrachloride is a volatile liquid with strong asphyxiating odor. It can be used as raw materials for the production of gaseous silica, high purity silicon and organosilicide. The upstream of the silicon tetrachloride industry chain is the raw material market, mainly silicon powder, ferrosilicon, hydrogen chloride, etc.