How far is my country's silicon industry from the international advanced level!baby bibs silicone custom

　　Not long ago, I met a friend in the silicone industry at the Guangzhou Environmental Protection Technology Expo. Although I have been out of this industry for some time, there is an old saying: It is a pleasure to have a friend from afar? It is reasonable to meet for tea and chat. When it comes to his plans for this year, his worries about the industry, especially the methyl chloride monomer industry, are palpable.

　　Looking back from 2010 to the present, the domestic silicone monomer industry has been in a state of flux, with strong and powerful players, and the rapid expansion of production capacity is the characteristic of this period. Private capital, represented by Hopson, Hengyecheng, Dongyue and Jinling, took the lead, not only expanding and strengthening methylchlorosilane monomer technology and production capacity, but also achieved success in metal silicon refining and silicon-fluorine co-production. Not a bad record; Xin'an Group, which started with the dimethyl phosphite industry, not only digested and absorbed Momentive's technology in recent years, but also took a key step in the expansion of monomer and silica gel production capacity, further strengthening the grass The scale benefit of the co-production of glyphosate and organosilicon, and a useful attempt has been made in silicon products; Sanyou has gained technical and operational experience in the co-production of methylchlorosilane monomer and trichlorosilane monomer, and silica gel production , laying the foundation for its further expansion of production capacity; Bluestar Group's newly built 200,000-ton/year methylchlorosilane monomer plant using Rhodia technology has been put into trial operation, and the production line for downstream products such as organic silicon has been operating normally.

　　Objectively speaking, the super "copying" ability of domestic silicone manufacturers has not only broken the pattern of domestic silicon product raw material market dependence on imports, but also enabled the rapid development of the silicone rubber product industry. The field of application of the material is expanded. On the whole, although the situation of overcapacity in the domestic monomer market will be further exacerbated, the listing of Sichuan Sifeng silicone business indicates that mergers and acquisitions will become the highlight of the silicone industry this year, but China's silicone industry is healthy and stable. The overall pattern of development has been formed.

　　One of the hottest posts on the China Silicone Forum recently is to discuss the advantages and disadvantages of methyl chlorosilane fluidized bed reactors. I think there is no need to discuss this issue. Each manufacturer has its own KNOWHOW. Its characteristics, meanwhile, the production of methylchlorosilane is a systematic project, and the fluidized bed is only one of its core technologies. For engineers and technicians, material consumption and energy consumption in the production process are two economic and technical indicators that need to be carefully calculated, which is the primary criterion for measuring the advanced nature of a set of devices.

　　Things choose the sky to compete, and the fittest survives. Leaving aside the current hotly debated cutting-edge technology for the direct preparation of siloxanes from silica, I think the leaders of the silicone industry must have a big vision and a big pattern. It is difficult to stand on the commanding heights of the industry by "copying" alone. Repeatedly compare vertically and horizontally, and continuously optimize production technology and business model with an innovative mentality.

　　Well, here comes the question! How far are we from the international leading level?

　　Before answering this question, let's identify the relevant metrics (besides quality) for the "level" of methylchlorosilane production:

　　n product plan;

　　n the total material balance of the base plant;

　　n methylchlorosilane (MCS) fluidized bed capacity;

　　n Dimethyldichlorosilane (DMDCS) selectivity;

　　n Material consumption (MeOH, Si, HCl, etc.);

　　n energy consumption (water, electricity, gas, etc.);

　　After determining the above indicators, let us first see what is the international leading level! (It must be stated here: all data come from public information or network data)

　　1. Product Solution

　　n Polydimethylsiloxane (PDMS) 190kt/a

　　n Methyl hydrogen silicone oil (MeH-OH) 5kt/a

　　n Hexamethyldisiloxane (EBB) 5.6kt/a

　　n Methyltrichlorosilane (MTCS) 17kt/a

　　n Trichlorosilane/silicon tetrachloride mixture (TCS/STC) 37.5kt/a

　　When I saw this product plan for the first time, my first reaction was to ask: Why was such a product plan determined? What are the advantages of the program?

　　By analyzing the above product solutions, we believe that it includes the following basic information:

　　n Investors' downstream units can use PDMS as raw material to produce products such as 107 glue or silicone oil, instead of DMC or D4 commonly used in China.

　　n Investors or their partners have the ability to digest by-products such as methyltrichlorosilane and silicon tetrachloride, and the only device that digests these by-products is fumed silica.

　　n Investors have the ability to digest the consumption market of hydrogen silicone oil and hexamethyldisilazane.

　　n The product plan includes system-wide chlorine balance information, namely:

　　? After dimethyldichlorosilane is hydrolyzed, polydimethylsiloxane (PDMS) is generated, and the chlorine in it is recovered in the form of hydrogen chloride as a raw material for the production of methyl chloride.

　　? After methylhydrogendichlorosilane is made into methylhydrogen-containing silicone oil, the chlorine in it is recovered in the form of hydrogen chloride, which is used as the raw material for the production of methyl chloride.

　　? After the production of hexamethyldisilazane from methyltrichlorosilane, the chlorine in it is recovered in the form of hydrogen chloride and used as the raw material for the production of methyl chloride.

　　? By-products such as methyltrichlorosilane and silicon tetrachloride are sent to the fumed silica plant, where chlorine is recovered for the production of methyl chloride.

　　The chlorine recovery rate for the entire base plant calculated from the total plant material balance diagram is 92-95%. (see follow)

　　n The product scheme contains the metal-silicon balance information of the whole system, namely:

　　The silicon powder that meets the particle size requirements is screened by the silicon powder processing device and supplied to MCS for synthesis, and the remaining silicon powder (including fine powder) is used by TCS/STC.

　　The metal silicon utilization rate calculated according to the total material balance diagram is as high as 96 - 98%. (see follow)

　　The basis for determining the product plan should be based on market research, the financial strength of the investor, the reliability of the source of process technology, the capacity of downstream devices, and the total transportation volume of the whole system.

　　In fact, the above product plan involves the MCS&TCS/STC combined device, and the downstream chemical plant and auxiliary facilities will be developed and functionally divided. It can be said that this product plan determines the basic direction of downstream product development and expansion.

　　What is the basis of the material balance?

　　Undoubtedly, the circulating element of the entire silane production system is chlorine, and the chlorine balance is the basis of the material balance of the whole system, and we said that the involved molecules such as silicon and methyl will go out of the silica gel processing plant with the product.

　　After analyzing the basic situation of the product plan, we will discuss the total material balance, and use this to measure various raw material consumption indicators, and based on this, we will discuss the space-time yield, heat transfer, structure and other issues of the MCS fluidized bed . (to be continued)

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