Process for intermittently recycling neopentyl glycol from neopentyl glycol waste liquid
A neopentyl glycol, intermittent technology, applied in the petrochemical field, can solve the problems of increasing economic benefits, clogging pipelines, reducing production costs, etc., and achieve the effects of increasing economic benefits, increasing purity, and reducing production costs
Inactive Publication Date: 2019-05-24
乐陵力维化学品有限责任公司
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Problems solved by technology
By adding butyl butyrate, use the heat carried by the distilled crude neopentyl glycol to vaporize the butyl butyrate, and after condensation, mix with the crude neopentyl glycol at the "T" interface to form neopentyl glycol The butyl butyrate solution of alcohol solves the problem of neopentyl glycol crystallization below 130°C to block the pipeline. Compared with the method of preventing crystallization by steam tracing, the heating process of the pipeline is omitted, and at least 0.7 per hour can be saved. t steam, reducing production costs and increasing economic benefits
Method used
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Embodiment 1
[0012] (1) Close all valves of the crystallization kettle, open the raw material feed valve, and 6 tons of yellow raw materials (50% neopentyl glycol, 40% gischenko ester, 10% water-soluble mixed alcohol impurities and Fe3+ ions) pass through the raw material pump to 200kg / min rate into the crystallization kettle;
[0013] (2) Turn on the circulating water to enter and exit the water, and at the same time turn on the stirring motor to start stirring in the kettle, and the circulating water passes through the jacket to cool down the raw materials in the crystallization kettle to 18°C;
[0014] (3) While keeping stirring, drop 280kg of liquid caustic soda with a concentration of 30% into the crystallization kettle at a constant rate of 9kg / min through the liquid caustic high level tank, and the dripping time should not be less than 30min, and always keep the temperature in the kettle at 15-20°C ;
[0015] (4) After the dropwise addition of liquid caustic soda is completed, unde...
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The invention provides a process for intermittently recycling neopentyl glycol from neopentyl glycol waste liquid. Before distilling the waste liquid, trivalent iron ions in the waste liquid are removed by means of adding alkaline liquid in a mild condition, so that product purity is improved, and product chromaticity index is improved. By adding butyl butyrate, heat carried by a neopentyl glycolcrude product which is distilled out is utilized to gasify butyl butyrate, butyl butyrate after being condensed is mixed with a gaseous phase of the neopentyl glycol crude product at a T-shaped interface to form a butyl butyrate solution of neopentyl glycol, and the problem that neopentyl glycol crystallizes and blocks a pipeline at temperature lower than 130 DEG C is solved; compared with a method of preventing crystallization through steam tracing, the process of heating the pipeline is omitted, 0.7t of steam can be saved per hour at least, production cost is lowered, and economic benefit isincreased. After distillation of the neopentyl glycol crude product is completed, recycled butyl butyrate is used as a re-crystallization solvent, and a neopentyl glycol product meeting standards canbe directly obtained through a method of direct gradual cooling, slow crystallizing separation and filtering separation. Overall energy consumption of the process is only about half of a rectification process through a rectification tower.
Description
technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to the technical application of neopentyl glycol raffinate, a by-product of neopentyl glycol produced by hydrogenation, in particular to a process for intermittently recovering neopentyl glycol from neopentyl glycol waste liquid . Background technique [0002] Neopentyl glycol, referred to as NPG, is a white crystalline solid, mainly used in the production of plasticizers and surfactants for unsaturated resins, oil-free alkyd resins, polyurethane foams and elastomers, and can also be used to synthesize insulating materials, For printing inks, polymerization inhibitors, synthetic aviation lubricating oil additives, etc., the performance of resins synthesized from neopentyl glycol is better than that of resins prepared from ethylene glycol. There are only 11 domestic neopentyl glycol manufacturers. In the case of continuously rising prices, the supply is still in short s...
Claims
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IPC IPC(8): C07C29/74C07C29/78C07C31/20
Inventor 邢忠舜赵启龙董其龙王建鹏乔雪张艺宁沈向丞石磊
Owner 乐陵力维化学品有限责任公司