An energy-saving process for methanol double-column double-effect rectification
A process method and double-effect rectification technology, applied in the field of chemical rectification, can solve the problem of too many steam lines, and achieve the effects of saving heating steam, reducing labor consumption, and saving post-processing costs
Active Publication Date: 2015-07-29
TIANJIN PULAITE SCI & TECH DEV
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Problems solved by technology
There are four rectification towers in this patent, and the outside world needs to provide steam heat for the three rectification towers of the pre-rectification tower, pressurization tower and methanol recovery tower respectively, and there are many steam lines
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[0027] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0028] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
[0029] The specific process is as figure 1 shown. The main equipment of the present invention includes negative pressure tower, negative pressure tower reboiler, condenser, positive pressure tower total condenser, negative pressure tower total condenser, raw material preheater I, raw material preheater II, raw material preheater Ⅲ, positive pressure column reflux tank, negative pressure column reflux tank, positive pressure column feed preheater, positive pressure column, positive pressure column reboiler. Among them, the steam discharge pipe at the top of the negative pressure tower is connected with...
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The invention relates to an energy-saving technical method for methanol double-tower double-effect distillation. Main equipment for the energy-saving technical method for methanol double-tower double-effect distillation comprises a negative pressure tower, a negative pressure tower re-boiler, a condenser, a positive pressure tower total condenser, a negative pressure tower total condenser, a material pre-heater, a positive pressure tower reflux tank, a negative pressure tower reflux tank, a positive pressure tower charging pre-heater, a positive pressure tower, a positive pressure tower re-boiler, and the like, wherein a tower-top steam discharging tube of the negative pressure tower is connected with a hot flow charging tube of the material pre-heater I, a tower-top steam discharging tube of the positive pressure tower is connected with a negative-pressure tower tower-kettle re-boiler, and the negative-pressure tower tower-kettle re-boiler is connected with the positive pressure tower charging pre-heater. By virtue of the flow, an integrated network is established, so that not only is much heated steam saved, but also cooling water consumption is reduced. And besides, the energy-saving technical method is optimized in process, simple to operate, high in purity of obtained methanol product, low in energy consumption, and has great industrial application prospect.
Description
technical field [0001] The invention relates to the technical field of chemical distillation, in particular to an energy-saving process for methanol double-tower double-effect distillation. Background technique [0002] The pharmaceutical industry is a pillar industry in the development of our province's national economy, and methanol is an organic solvent widely used in the pharmaceutical and chemical industries. Methanol is not only an important basic chemical raw material, but also a clean energy and power fuel with great development prospects, and the world's demand for it continues to increase. For many years, the methanol recovery system has been using the old process system and equipment, which has high energy consumption, low recovery rate and serious environmental pollution. At present, the main problems in the methanol solvent recovery system are as follows: Most of the domestic methanol recovery systems continue to use the old single-column rectification system, ...
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IPC IPC(8): C07C31/04C07C29/80
CPCC07C29/80C07C31/04Y02P20/10
Inventor 李春利王洪海耿海腾余迎新王荣良
Owner TIANJIN PULAITE SCI & TECH DEV