Method for treating and recycling waste water in production process of aromatic acid
A production process, aromatic acid technology, applied in natural water treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problem of high NaOH consumption, high capital investment and daily operating costs, RO system cannot be operated at high temperature. Problems such as running down
Inactive Publication Date: 2012-10-17
凯能高科技工程(上海)有限公司
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It can be deduced that a dual-stage RO would result in more capital investment and daily operating expenses compared to a single-stage RO system
Furthermore, said known methods require cooling of the wastewater stream since conventional RO systems cannot operate at high temperatures
It is well known that cooling processes are economically expensive in industrial processes due to the use of expensive refrigerants and thermodynamically inefficient compression cycles involved
[0010] In addition, there is also a high level of NaOH consumption in this known process, which further leads to further operating costs associated with obtaining the basic raw material
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[0072] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0073] Such as figure 1 as shown, figure 1 Process flow diagram for a system for recovering water from wastewater produced by the PTA purification process. Process 10 includes passing wastewater 12 through filter 20 , ion exchange column 40 , and reverse osmosis system 60 .
[0074] The PTA wastewater 12 produced from the PTA purification process 140 has a temperature of about 30-50° C. and a pH of about 1.5-3.5. The PTA wastewater stream 12 is first passed through a stainless steel membrane filter with a 0.05-0.1 micron pore size to remove any insoluble PTA present in the wastewater. The recovered solid PTA 13 will undergo further processing (not shown) to concentrate before recycling the PTA back to the aromatic acid production process 140 . Filtrate stream 14 contains various heavy metals in their respective ionic forms, such as Mg, Ca, Ni...
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Abstract
The invention relates to a method for treating and recycling waste water in the production process of aromatic acid. The waste water mainly contains saturated organic acid and a little amount of salt. The method comprises the following steps: leading the waste water raw material flow which mainly contains saturated organic acid and a little amount of salt under a certain saturated temperature to be heated and increase the temperature so as to retain concentrated organic acid and salt by reverse osmosis membrane technology under a certain temperature condition which is at least higher than theoriginal saturated temperature, thus generating clean seepage flow for recycling; and the clean seepage flow contains less organic salt and organic acid compared with that of the raw material flow. Compared with the prior art, the method has reasonable technique, no need of using large amount of NaOH, simple operation, low cost and low energy consumption.
Description
technical field [0001] The invention relates to waste water treatment, in particular to a method for treating and reusing waste water generated in the production process of aromatic acids. Background technique [0002] Aromatic acids are commercially important chemicals for the production of plastics. A particularly important aromatic acid is purified terephthalic acid (PTA) due to its use as a raw material for a variety of applications such as coatings, composites based on unsaturated polyester resins, hot melt adhesives and the production of polymeric The demand for ester fibers has been increasing in recent years. [0003] The increasing demand for polyester fibers made from polyethylene terephthalate (PET) has driven the industrial production of PTA. PTA is a raw material compound for PET production. PET is used to make fabrics for clothing and home furnishings such as bed sheets, bedspreads, curtains and draperies. Polyester fibers can also be spun with natural fibe...
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IPC IPC(8): C02F9/10C02F1/44C02F1/04C02F103/36
Inventor 林爱莲齐唯王文浪张崇能
Owner 凯能高科技工程(上海)有限公司