Methanol double-effect rectification high-elasticity combined technique and system therefor
A technology of double-effect rectification and combined process, which is applied in the field of methanol double-effect rectification and high-flexibility combined process and its system, can solve the problems of high ethanol content and high energy consumption, and achieve the effect of increasing flexibility
Active Publication Date: 2012-12-26
苏州盛泽科技创业园发展有限公司
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Problems solved by technology
[0005] Single-effect distillation has the advantages of simple process, convenient operation, stable operation, and low equipment investment costs, but it also has defects such as high energy consumption and high ethanol content in refined methanol
Method used
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Embodiment 1
[0032] With respect to the technological process of comparative example, present embodiment has been improved as follows:
[0033] The prognostic methanol at the bottom of the pre-distillation tower is divided into two strands by the prognostic methanol split flow control system 13 before entering the pressurizing tower, and the flow ratio of the two strands is 3: 1, wherein one (75%) is connected with the pre-distillation tower reboiler 7-1 and pressurized column reboiler 7-2 Steam condensed water exchanges heat in methanol heater 12 and is heated to 128°C to enter pressurized column 2.
[0034] Atmospheric tower does not go out side line, and methanol content is 13.51% (mol) methanol liquid and another prognostic methanol (25%) enters methanol recovery tower 4 through methanol recovery tower feeding buffer tank 14 in the methanol liquid at the bottom of the tower.
[0035] Using this process, part of the prognostic methanol in the pre-distillation tower is combined with the ...
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The invention discloses a methanol double-effect rectification high-elasticity combined technique which comprises the steps: (1) prognostic methanol at the bottom of a distillation tower is divided into two strands by a prognostic methanol diversion control system; (2) heat exchange is carried out between one strand of prognostic methanol and steam condensate of a pre-distillation tower and a reboiler of a pressurized tower in a prognostic methanol heater, and the strand of prognostic methanol is heated and then sent into the pressurized tower; (3) the other strand of prognostic methanol is mixed with waste liquid at the bottom of an atmospheric tower through a feeding buffer tank of a methanol recovery tower and then enters into the methanol recovery tower. The technique has the advantages that when a reaction system and the market demand fluctuate, the whole process flow can be switched into three proposals which are two-tower process flow (pre-rectifying tower / methanol recovery tower), three-tower process flow (pre-rectifying tower / pressurized rectifying tower / atmospheric tower) and four-tower process flow (pre-rectifying tower / pressurized rectifying tower / atmospheric tower / methanol recovery tower).
Description
technical field [0001] The invention relates to the technical field of purification of chemical products, in particular to a methanol double-effect rectification high-elastic combined process and a system thereof. Background technique [0002] Methanol is a very important basic chemical raw material, and also a clean energy and power fuel with excellent performance, which plays a pivotal role in the global chemical product market. In recent years, due to the rapid development of the three major synthetic materials, the world's demand for methanol has increased dramatically. [0003] Distillation is a very important chemical unit operation in methanol production, which is directly related to product quality, environmental protection, energy consumption, production costs and other issues. Therefore, the improvement of rectification process has attracted more and more attention. [0004] The rectification units in the existing methanol rectification devices in my country are r...
Claims
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IPC IPC(8): C07C31/04C07C29/80B01J23/75B01J23/72B01J23/755B01J23/80B01J23/83B01J37/00C01B3/32
CPCY02P20/52
Inventor 孙津生王艳红高红张晓宫春美
Owner 苏州盛泽科技创业园发展有限公司