Vacuum regeneration method of butyl rubber clean solvent oil
A technology of butyl rubber and solvent oil, which is applied in the field of regeneration of solvent oil in cleaning reaction kettles in the production of butyl rubber, can solve the problems of high boiling point of hydrocarbon cleaning agents, shortened service life, and reduced water vapor consumption, etc., and achieves a solution MeCl decomposes corrosion problems, increases cleaning ability, and increases the effect of humanization
Active Publication Date: 2013-11-06
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology
[0004] A fatal shortcoming of the above process is that the operating temperature is above the decomposition temperature of MeCl (monochloromethane) and the decomposition temperature is above 110°C. The MeCl dissolved in the solvent oil decomposes, and the decomposed hydrogen chloride causes serious corrosion to the entire system in the presence of trace amounts of water. , the service life of the equipment is greatly shortened
[0005] CN1846827A discloses a method for recovery and regeneration of lotion by vacuum distillation, which solves the problem of high boiling point and difficult distillation recovery of hydrocarbon cleaning agents by adopting vacuum distillation and recovery
The disadvantage is that coiled tubes are installed in the distillation tank, and the heat exchange efficiency is lower than that of the tube heat exchange of the present invention
[0006] CN1074836A discloses a method for steam distillation using a jet pump, which solves the problems of accelerating the heat transfer and mass transfer rate of the distillation system and reducing the consumption of steam
The disadvantage is that the water vapor is in direct contact with the material, so it can only be used in a system where the water vapor and the material have no chemical reaction
Method used
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Embodiment 1
[0026] The processing steps of this embodiment are:
[0027] a. The solvent oil of the washing reactor is directly sent to the solvent oil storage tank 1, and then the solvent oil containing glue to be regenerated is sent to the solvent oil regeneration kettle 3 by the solvent oil recovery pump 2;
[0028] B, the solvent oil regeneration still 3 of described solvent oil regeneration still 3 adopts the solvent oil regeneration still 3 of tank type heat exchanger, operates under the vacuum condition that is provided by vacuum injector group 5, the solvent oil and MeCl gas after its top regenerates through solvent oil After the cooler 4 is cooled, the solvent oil is condensed and recycled to the solvent oil storage tank 1 for recycling; MeCl and non-condensable gas are discharged to the recovery treatment system for treatment;
[0029] c. The waste rubber solution at the bottom of solvent oil regeneration kettle 3 (the glue content in the waste glue solution is 5-20%) is discharg...
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Abstract
The invention relates to a vacuum regeneration method of butyl rubber clean solvent oil. In the invention, the vacuum regeneration method is adopted, and a solvent feeding heater and a solvent steam stripping kettle are not required. In the invention, a vacuum heating operation is adopted in the clean solvent oil regeneration kettle, the regeneration temperature of the solvent oil is reduced to below the decomposition temperature of MeCl, and the noncondensable gas MeCl and water vapor are returned back to a MeCl recovery unit through single vaporization; the condensed solvent oil enters into a solvent oil storage tank; unevaporated glue liquor is concentrated in the solvent oil regeneration kettle to a certain degree and then discharged to a water glue barrel; and in addition, an automatic stop valve controlled by a weight signal is added in the waste glue discharging part, and when the waste glue barrel is full, the valve is automatically opened and closed, thereby increasing humanity of operation.
Description
technical field [0001] The invention relates to the field of butyl rubber production, in particular to a method for regenerating solvent oil in a cleaning reactor during butyl rubber production. Background technique [0002] In the production process of butyl rubber, after a period of continuous operation of the reactor, glue hanging will inevitably occur. Therefore, after a period of operation, solvent cleaning should be used, and the solvent oil used for cleaning should be regenerated and recycled. Solvent oil is a mixture of hydrocarbons with a distillation range of 150-300°C. [0003] The regeneration of the cleaning solvent oil in the prior art adopts a two-step separation process: after the reactor cleaning solvent oil is first heated by the solvent oil feeder, MeCl is separated from the top of the solvent oil stripping tank; Collected into the solvent oil storage tank, then pumped to the solvent oil regeneration tank and heated to about 200 ° C, the solvent oil is ev...
Claims
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IPC IPC(8): C10G31/06
Inventor 丁文有胡畔陈茂春
Owner CHINA PETROCHEMICAL CORP