A continuous cracking process for organosilicon hydrolyzed oil
A technology for hydrolysis of oil and silicone, applied in the field of cracking technology, can solve the problems of reducing the effect of mass transfer and heat transfer of the system, reducing production efficiency, and difficult processing, so as to realize the recovery and utilization of reaction residues, increase speed and output, The effect of reducing viscous drag
Active Publication Date: 2020-12-08
王谌树
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Problems solved by technology
[0002] In the organosilicon industry, most organosilicon polymers are produced from the organosilicon intermediate DMC, so DMC plays an extremely important role in the organosilicon industry. Now the main raw material for producing DMC at home and abroad is dimethyldichlorosilane The hydrolyzed oil produced by the hydrolysis reaction includes cyclic siloxane and linear polysiloxane, but there are many deficiencies in the current preparation of DMC. Oil is added into the cracking tank as a heat carrier for cracking reaction. Since this solvent cracking process is a batch reaction, the time for preparing the DMC cracking process is prolonged, and continuous discharge cannot be realized, resulting in cracking residues accumulated at the bottom of the tank for a long time. The disproportionation reaction occurs under alkaline conditions, which makes the structure of the residue complex and difficult to handle. Moreover, in the later stage of the solvent cracking reaction, due to the continuous accumulation of cracking residues, the viscosity of the reaction system continues to increase, thereby greatly reducing the mass transfer and heat transfer effects of the system. Affect the formation and phase change distillation of the reaction product DMC, reducing its production efficiency
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[0050] (1) Preheating: Add cracking catalyst to the raw material kettle containing hydrolyzate for preheating to form cracking raw material; and the addition amount of cracking catalyst is 0.1-3.0% of the hydrolyzate mass, and the preheating temperature is 70-90°C, Preheat and stir for 1-2 hours to form cracking raw materials;
[0051] (2) First-level rearrangement: The cracked raw material enters the horizontal thin film evaporation reactor quantitatively at a speed of 500kg / h through the feeding pump. Stir the cracking raw material to make the cracking raw material form a thin film whose interface is constantly renewed on the inner wall of the thin film evaporation reactor, and carry out one-stage rearrangement under the conditions of an oil temperature of 80-150°C, a catalyst, and a vacuum of 0.03-0.1MPa to form First-class DMC gas, the composition of first-class DMC gas includes 2-6% D3, 80-88% D4, 8-12% D5, 2-5% D6 and 2-4% D7;
[0052] (3) Primary cooling: the primary D...
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The invention discloses a continuous pyrolysis process for organic silicone hydrolysis oil. The process comprises a preheating stage, a primary rearrangement stage, a primary cooling stage, a secondary rearrangement stage, a secondary cooling stage and a reaction residue processing stage. The process provided by the invention realizes continuous and stable production and continuous material discharging effects throughout the year, improves the efficiency and yield of production of DMC, and effectively recycles residues.
Description
technical field [0001] The present invention relates to cracking technology field, relate to a kind of organosilicon hydrolysis oil continuous cracking technology more specifically. Background technique [0002] In the organosilicon industry, most organosilicon polymers are produced from the organosilicon intermediate DMC, so DMC plays an extremely important role in the organosilicon industry. Now the main raw material for producing DMC at home and abroad is dimethyldichlorosilane The hydrolyzed oil produced by the hydrolysis reaction includes cyclic siloxane and linear polysiloxane, but there are many deficiencies in the current preparation of DMC. Oil is added into the cracking tank as a heat carrier for cracking reaction. Since this solvent cracking process is a batch reaction, the time for preparing the DMC cracking process is prolonged, and continuous discharge cannot be realized, resulting in cracking residues accumulated at the bottom of the tank for a long time. The...
Claims
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IPC IPC(8): C07F7/21
CPCC07F7/21
Inventor 王谌树
Owner 王谌树