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Methanol double-effect rectification high-elasticity combined technique and system therefor

An ethanol and mixed solution technology, applied in the preparation of hydroxyl compounds, the preparation of organic compounds, inorganic chemistry, etc., can solve the problems of high ethanol content and high energy consumption, and achieve the effect of increasing flexibility

Active Publication Date: 2009-12-23
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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  • Methanol double-effect rectification high-elasticity combined technique and system therefor

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Embodiment 1

[0032] With respect to the technological process of the comparative example, the present embodiment has made the following improvements:

[0033] The predicted methanol at the bottom of the pre-distillation tower is divided into two parts by the predicted methanol split control system 13 before entering the pressurizing tower. 7-1 and the pressurized tower reboiler 7-2, the steam condensed water exchanges heat in the methanol heater 12, and is heated to 128 °C and enters the pressurized tower 2.

[0034] There is no side line in the atmospheric tower, methanol liquid with methanol content of 13.51% (mol) in the methanol liquid at the bottom of the tower and another prognostic methanol (25%) enter the methanol recovery tower 4 through the methanol recovery tower feed buffer tank 14.

[0035] This process is used to combine part of the methanol in the pre-rectification tower with the bottom liquid of the atmospheric pressure tower and then enter the methanol recovery tower for p...

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Abstract

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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Application Information

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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
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