System and method for reduction of water consumption in purified terephthalic acid production
A technology of terephthalic acid and p-toluic acid, applied in chemical instruments and methods, separation methods, organic chemical methods, etc., to achieve the effect of easy installation and increased capital expenditure
Active Publication Date: 2013-06-05
AMT INT INC
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Problems solved by technology
[0014] However, even with these recent improvements, large amounts of freshly treated water are still required, approximately 2.1 tons of make-up water per ton of pure terephthalic acid produced
Method used
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Embodiment 1
[0114] Table 2. Contents of different streams in a typical prior art acetic acid recovery system, such as figure 2 shown.
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Embodiment 2
[0118] Table 3. Contents of various streams in a prior art acetic acid recovery system modified from Ohkoshi et al., as image 3 shown.
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Embodiment 3
[0122] Table 4. Contents of various streams in the application process for recovery of acetic acid and water from aqueous streams, such as Figure 4 shown.
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[0126] These results are summarized in Table 1.
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The invention disclosed is an apparatus and method for the recovery of acetic acid, azeotropic agent, extraction agent, re -usable water and other reaction products such as p-toluic acid, from an aqueous stream generated during a terephthalic acid production process, having superior energy efficiency and reduced water consumption.; The apparatus of the invention includes: an azeotropic distillation column to remove water from acetic acid, a pair of mother liquor extraction columns sequentially connected in series for primary recovery of extraction solvent and other organics, an azeotropic agent stripper for recovery of azeotropic agent and a post-separation solvent stripper distillation column for further separation of the aqueous bottoms stream from said extraction columns into a volatiles stream comprising mainly organics with a very low amount of water and a liquid stream comprising water containing very low amounts of organics, each stream being sufficiently pure that it can be recycled for reuse in the purification of crude terephthalic acid.
Description
technical field [0001] The present invention generally relates to reducing water consumption and improving energy efficiency in chemical processes for the distillation of industrial chemicals, and is particularly suitable for reducing water consumption in the production of pure terephthalic acid. Background technique [0002] Terephthalic acid is useful in a variety of industrial applications and chemical processes. For example, terephthalic acid is a raw material for the production of polyesters including plastics and Dacron™ for textile and container production. Polyethylene terephthalate (PET), a form of polyester or Mylar™, is a very strong resin and is used in many industrial and consumer applications. Soft drink and mineral water bottles are also made from this resin, in addition to plastic bottles and clamshell bags used for consumer good transport and food delivery. Pure terephthalic acid is a higher grade of terephthalic acid used in finer industrial applications....
Claims
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IPC IPC(8): B01D3/36
CPCB01D3/36B01D3/143B01D3/40B01D3/00C07B63/00
Inventor 张智英吴匡宇杨明谋
Owner AMT INT INC
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