Synthesis Methods Of Trichlorosilane-manufacture,factory,supplier from China

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.

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.

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.

Trichlorosilane is mainly used in the manufacture of polysilicon and silane coupling agents, among which polysilicon is the most important downstream application area of trichlorosilane, accounting for 32% of the consumption in 2021, and silane coupling agent consumption accounted for 25%. The market is still in good condition.

Trichlorosilane is a higher degree of marketization, competition is more adequate industry. The price of industrial products is easily affected by upstream raw materials and downstream demand. Trichlorosilane production raw materials are mainly industrial silica powder and liquid chlorine, if the raw material prices rise sharply, it profits will be under pressure. The price fluctuation of trichlorosilane has little effect on the profits of polysilicon enterprises. Even if the price is temporarily low, polysilicon prices still have upward momentum. 

A high purity trichlorosilane differential pressure coupled distillation process, using the high pressure tower top steam as the heat source of the low pressure tower reboiler, realized the energy integration and process optimization. Chemical simulation software PRO/Ⅱ8.1 was used to simulate the design parameters of two columns of high purity trichlorosilane differential pressure coupled distillation process and three columns of high purity trichlorosilane differential pressure coupled distillation process.

Since May 2022, trichlorosilane has been sustained upward by the downward trend in silicon metal prices.

The production process of trichlorosilane is mostly prepared by reaction of gold-grade silicon metal powder and hydrogen chloride gas in a fluidized bed reactor. Generally using gold grade metal silicon powder, hydrogen chloride gas by the combustion reaction of chlorine and hydrogen gas. Reaction temperature is 300-400 degrees, most of the pressure using micro positive pressure operation.

Silane coupling agent product price growth is very obvious, compared with the same period last year growth of 118%. Upstream raw material trichlorosilane price rise, silane products for the high price operation provides a strong support. Reporters learned that trichlorosilane is mainly used in the production of polysilicon, silane coupling agent, silane coupling agent is the second largest downstream market of trichlorosilane, in recent years the demand is more exuberant.

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.

Electronic grade trichlorosilane sihc13 is colorless, flammable, corrosive liquid and has a suffocating odor. Hydrolyze rapidly in wet air to produce hydrogen chloride: boiling point 31.9 ':. Melting point 126.5 c:. Liquid density 134ukgi resistance: in the air "}", the flammability limit is B.9% - 7U}'u. Flash point - 28. U}.

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.

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.

Trichlorosilane (TCS or SiHCl3) is generated as follows within a high temperature, pressurized reactor: Si + 3 HCl ➡ SiHCl3 + H2 ，Si + 3 SiCl4 +2 H2 ➡ 4 SiHCl3 .The TCS is then sent to the CVD (Chemical Vapor Desposition) reactor. In the Siemens process, high-purity silicon "starter" rods or hairpins are exposed to trichlorosilane at 1150 °C in the CVD reactor.

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 principle is to reduce high purity trichlorosilane with high purity hydrogen on the high purity silicon core at about 1100℃ to generate polycrystalline silicon deposited on the silicon core. On the basis of the traditional Siemens process, the improved Siemens process is equipped with a supporting process of energy saving, consumption reduction, recycling and utilization of a large amount of H2, HCI, SiCI4 and other by-products and a large amount of by-production heat energy.

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.

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Chlorine hydrogenation technology is to add HCl on the basis of low temperature hydrogenation technology to further reduce the reaction temperature and increase the yield of trichlorosilane. Chlorine hydrogenation reaction principle is as follows: 2SiCl4(g)+H2(g)+HCl(g)+Si(s)=3SiHCl3(g). Hydrogen plasma is generated by hydrogen discharge, which is passed into the reactor to react with silicon tetrachloride gas. Since hydrogen is dissociated into hydrogen atoms, the reactivity is greatly increased and it can easily react with silicon tetrachloride to form trichlorosilane.

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.

Colorless liquid with smelly odor. it'll decompose with water and dissolve in carbon disulfide, carbon tetrachloride, chloroform, benzene, and plenty of others. flammable, can spontaneously ignite within the air. toxic!It could go through an addition response with olefins.The hydrosilylation response of ethylene is as follows: cl3si-h + h2c=ch2 → cl3si-ch2-ch3 .

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.