Process for recovering siloxane from concentrated hydrochloric acid and refining coarse chloromethane
A crude methyl chloride and combined process technology, applied in the chemical field, achieves the effects of less pollution, advanced technology, and low consumption of chemical raw materials
Inactive Publication Date: 2013-12-04
余家骧
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Problems solved by technology
[0011] The technical problem to be solved by the present invention is to substantially improve the deficiencies of the existing technology, and provide a method with advanced technology and low consumption of chemical raw materials, which can not only recover siloxane, but also refine crude methyl chloride. , high recovery rate, avoiding pipeline and equipment blockage, low cost, less pollution, and environmentally friendly combined process of recovering siloxane from concentrated hydrochloric acid and refining crude methyl chloride
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Embodiment Construction
[0034] Use the attached figure 2 And embodiment the present invention is described further.
[0035] refer to figure 2 , take the reformation of existing large-scale organosilicon plant as an example with the combined process of reclaiming siloxane from concentrated hydrochloric acid and refining crude methyl chloride of the present invention:
[0036] 1. Able to recover high-quality siloxane to solve equipment and pipeline blockage;
[0037] 2. used water washing tower 103, alkali washing tower 104 used for the purification of methyl chloride, the first sulfuric acid washing tower 105, the second sulfuric acid washing tower 106 and the third sulfuric acid washing tower 107 are five towers altogether, with a tower of methyl chloride refining tower 113 Substitution, simplifying the refining process;
[0038] 3. The recovered dimethyl ether is used as a raw material for the synthesis of methyl chloride.
[0039] The process flow is: concentrated hydrochloric acid 13 contai...
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The invention discloses a process for recovering siloxane from concentrated hydrochloric acid and refining coarse chloromethane, which is characterized by comprising: removing siloxane from hydrochloric acid (13) by using a CH3Cl and C7 compound extracting agent and by two stages of extraction and two stages of filtration; recovering siloxane with a purity of 99.5 to 99.9 (weight) percent after concurrent evaporation, stripping by hot CH3Cl, falling film evaporation and vacuum flash vaporization; recovering all CH3Cl and C7 from HCl gas from vacuum flash vaporization; absorbing coarse chloromethane by using concentrated hydrochloric acid 14 at a concentration of 30 to 32 (weight) percent, and coarsely removing ether; mixing with liquid CH3Cl, cooling at -24 DEG C, drying, and removing ether finely. The invention has the advantages that: the process is advanced; the chemical raw material consumption is low; siloxane can be recovered, the coarse chloromethane is refined; the recovery rate is high; the pipe and equipment blockage is avoided; the cost is low; pollution is basically avoided; environment protection is promoted; and the like.
Description
technical field [0001] The invention relates to the field of chemistry, and relates to a combined process for recovering siloxane from concentrated hydrochloric acid and refining crude methyl chloride. Background technique [0002] Suggestions on the production and purification of methyl chloride and HCl circulation process in the existing large-scale organosilicon plant figure 1 , at the bottom of the methyl chloride synthesis reactor 101, methanol vapor and HCl gas are bubbled through the catalyst saturated ZnCl 2 The solution produced crude methyl chloride. Because the gas-liquid contact area is too small, the crude methyl chloride gas contains 3-5% (wt) dimethyl ether. After passing through the graphite water cooler 102, the acidic condensate 12 is sent to the dimethyldichlorosilane hydrolysis process 400 by the pump 112. Add azeotropic acid 16 and dimethyldichlorosilane 11 into the acid condensate 12 to generate hydrolyzate siloxane 17 and concentrated hydrochloric a...
Claims
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IPC IPC(8): C07F7/08C07C19/03C07C17/093C07C17/38
Inventor 余家骧
Owner 余家骧