3results about How to "Avoid disproportionation reactions" patented technology

The invention belongs to the field of gas technical purification, and particularly relates to a honeycomb-shaped high-concentration NO2 adsorption trapping material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing adsorbent slurry by taking high-silicon molecular sieve raw powder as a raw material; (2) putting a honeycomb carrier into the adsorbent slurry for dipping and coating; and (3) naturally airing, drying and roasting the impregnated carrier to obtain the integral honeycomb-shaped high-concentration NO2 adsorbing and trapping material. On the basis of the honeycomb-shaped high-concentration NO2 adsorption trapping material (the molecular sieve silica-alumina ratio is 1000-5000), NO2 is efficiently trapped through a pressure swing adsorption technology, meanwhile, the adsorbent subjected to adsorption saturation is reversibly regenerated, high-concentration NO2 desorbed gas is obtained, NO2 recycling is achieved, NOx tail gas of a nuclear industry post-treatment plant is recycled, and the purpose of recycling the NOx tail gas of the nuclear industry post-treatment plant is achieved. A stable NO2 gas source is provided for a spent fuel post-treatment main process, the dual requirements of NO2 raw material preparation and tail gas denitration of a post-treatment plant are met, and purification and recycling of NO2 are achieved.

This utility model discloses a system for removing impurities from carbon-containing chlorosilanes and recovering chlorosilanes, comprising: a first distillation column for receiving and concentrating carbon-containing chlorosilanes; a first adsorption and reaction device connected to the first distillation column, the first adsorption and reaction device being filled with a metal adsorbent material and equipped with a silicon tetrachloride feed pipeline; a second adsorption and reaction device connected to the first adsorption and reaction device, the second adsorption and reaction device being filled with a methyldichlorosilane adsorbent material; a second distillation column connected to the second adsorption and reaction device; and a third distillation column connected to the second distillation column. This utility model can adsorb and concentrate metal impurities in carbon-containing chlorosilanes as a catalyst for the carbon removal reaction, effectively avoiding deactivation and failure caused by metal impurities encapsulating the resin catalyst, improving the conversion rate of methyldichlorosilane, and effectively avoiding the disproportionation reaction of silicon trichloride in the presence of the resin catalyst, thereby improving the carbon removal efficiency and chlorosilane recovery efficiency.

The invention belongs to the technical field of electronic-grade trimethylsilane, and particularly relates to a purification method and application of electronic-grade trimethylsilane. Comprising the following steps that S1, a trimethylsilane raw material and diluent gas are mixed and introduced into an adsorption tower, components with the boiling point similar to that of trimethylsilane are removed, a trimethylsilane crude product is obtained, and filler of the adsorption tower is a mixture of activated carbon and metal oxide; and S2, introducing the trimethylsilane crude product into a light component removal tower to remove light components, and then introducing the trimethylsilane crude product into a heavy component removal tower to remove heavy components so as to obtain the electronic-grade trimethylsilane. Impurity components such as dimethylsilane in the trimethylsilane raw material, which are similar to the boiling point of the trimethylsilane, are reduced in the content of the components such as the dimethylsilane through the adsorption tower. Diluting gas is added before the trimethylsilane raw material is introduced into the adsorption tower, so that the heat release effect during adsorption is reduced, and disproportionation reaction is avoided. Meanwhile, the added metal oxide in the filler has a synergistic effect with the diluted gas, so that the adsorption heat release is reduced.