Rectification device and rectification method for oxo-synthesis of acetic acid
A technology for oxo synthesis and acetic acid, applied in the field of rectification devices for oxo synthesis of acetic acid, can solve problems such as difficulty in separation, inability to handle hydrogen iodide, etc., and achieve the effects of reducing steam consumption, saving steam consumption, and saving steam
Active Publication Date: 2020-09-11
PUJING CHEM IND SHA
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Problems solved by technology
The device and process method are only applicable to the acetic acid and water system, and a simple dividing wall tower with a closed bottom is used. Facing the oxo acetic acid system with complex components, the design of the dividing wall tower, the discharge position, and the design of the auxiliary tower are difficult to realize. Due to the specific requirements of this system, it is difficult to achieve effective separation, and it is impossible to deal with hydrogen iodide in the by-product
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[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] A rectification device for carbonylation of acetic acid, with a partition 1 inside, used for partition rectification of crude acetic acid in carbonylation of acetic acid, the partition 1 is vertically arranged in the rectification section at the top of the tower and at the bottom of the tower Between the distillation sections, the space on both sides of the separator 1 forms the first rectification zone 2 and the second rectification zone 3 respectively. The total number of layers of trays is 60 to 150 layers. The first rectification zone 2 or the second rectification zone 3 accounts for 50-90% of the number of trays.
[0036] The first rectification zone 2 communicates with the bottom and the top of the second rectification zone 3 to form a public rectification section 4 and a public stripping section 5; the first rectification zone ...
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The invention relates to a rectification device for oxo-synthesis of acetic acid. A partition plate (1) is arranged in the rectification device and is used for partition wall rectification of crude acetic acid in oxo-synthesis of acetic acid, and the partition plate (1) is vertically arranged between a tower top rectifying section and a tower bottom stripping section, so that a first rectificationzone (2) and a second rectification zone (3) are respectively formed in spaces on two sides of the partition plate (1); the bottom ends and the top ends of the first rectification zone (2) and the second rectification zone (3) are communicated to form a common rectification section (4) and a common stripping section (5); the first rectification zone (2) is provided with a crude acetic acid feed port (21) and a methanol injection assembly (22); and the second rectification zone (3) is provided with a high-purity acetic acid discharge port (31). The acetic acid purity of the product reaches thesuperior product level, and the energy consumption is reduced to 0.5-0.8 t steam / t acetic acid compared with 1.8 t steam / t acetic acid rectified by three towers.
Description
technical field [0001] The invention relates to a crude acetic acid rectification process, in particular to a rectification device and a rectification method for carbonylation of acetic acid. Background technique [0002] The traditional acetic acid plant uses three rectification towers, first delight, then dehydration (second delight), and finally deweight, acetic acid is extracted from the top of the tower. The one-time investment of the acetic acid plant is large; on the other hand, two of the three rectification towers need to use medium-pressure steam, and the steam consumption per ton of acetic acid is about 1-1.8t. The energy consumption is large, and the separation cost of acetic acid is high. [0003] Therefore, there is an urgent need to develop a high-efficiency energy-saving device suitable for oxo-synthesizing acetic acid and a specific rectification method, so as to realize industrial production. [0004] CN107638709A discloses a separation device for acetic a...
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IPC IPC(8): B01D3/14C07C51/12C07C53/08
CPCB01D3/14C07C51/12C07C53/08
Inventor 纪海霞潘科毕永胜鲁文质王学珍覃建华
Owner PUJING CHEM IND SHA