CN103435475A - Method for recycling benzoic acid from benzoic acid waste water - Google Patents
Method for recycling benzoic acid from benzoic acid waste water Download PDFInfo
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- CN103435475A CN103435475A CN201310295828XA CN201310295828A CN103435475A CN 103435475 A CN103435475 A CN 103435475A CN 201310295828X A CN201310295828X A CN 201310295828XA CN 201310295828 A CN201310295828 A CN 201310295828A CN 103435475 A CN103435475 A CN 103435475A
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- rubber membrane
- silicone rubber
- benzoic acid
- waste water
- membrane pipe
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Abstract
The invention discloses a method for recycling benzoic acid from benzoic acid waste water, and is characterized by comprising the following steps: (1) a silicone rubber membrane pipe is supported by an upholder to hover in a reactor, a wound silicone rubber membrane contactor is prepared, and an alkaline extraction liquid is distributed in the reactor outside the silicone rubber membrane pipe; (2) an acid is added to adjust the pH of the benzoic acid waste water to 1-2; and (3) the benzoic acid waste water with the adjusted pH flows circularly in the silicon rubber membrane pipe of the wound silicone rubber membrane contactor through a peristaltic pump under conditions of the temperature of 20-60 DEG C and the flow velocity of 2.2-4.4 mL/min, and at the same time, electric stirring is started, so that benzoic acid passing through the silicone rubber membrane pipe and then going into the alkaline extraction liquid is uniformly dispersed. With the method of the invention, the recycling rate of benzoic acid can reach more than 90%, the recycled benzoic acid has high purity and can be circularly used in production, so important significance in saving resources, reducing environmental protection pressures of enterprises and improving economic benefits is provided.
Description
Technical field
The invention belongs to technical field of waste water processing, be specifically related to a kind of from phenylformic acid waste water the method for recovery of benzoic acid.
Background technology
Phenylformic acid is the common environmental pollutant of a class, often is present in the waste water of chemical industry, food and medicine industry.Because phenylformic acid has stronger bacteriostatic action, so that the processing that contains benzoic trade effluent has larger difficulty.Phenylformic acid in waste water has not only limited the selection of method of wastewater treatment, and causes the very large wasting of resources, also environment is produced to larger pollution simultaneously.
For making to reach discharging standards containing phenylformic acid waste water, the method for processing at present phenylformic acid waste water mainly contains solvent extraction, absorption and liquid-film method etc.But also there are some drawbacks in these methods when its corresponding advantage is respectively arranged, and for example: solvent extration has solvent loss, needs secondary treatment, and technique is loaded down with trivial details; In absorption method, sorbent material needs regeneration, and reclaim equiment is huge and cost is higher; Liquid-film method is high to operational requirement, and has unstable.
The membrane permeation extraction process was a kind of new separation technology that membrane technique and liquid-liquid extraction technology combine, and at first Livingston etc. proposed this technology in 1992.This technology has that efficiency is high, energy consumption is low, process operation is simple and the advantage such as stable.Silicone rubber membrane is a kind of hydrophobicity non-porous film of being made by the homogeneous polymer material, it has the selection perviousness to the molecular state organism, utilize this characteristic, feed liquid side organic molecule can see through the nonporous silicon rubber diaphragm and enter the extraction liquid side, the ionic state material can't see through this film, thereby realized separating of molecular state organism and inorganics, for having, utilized the organic recovery be worth to have great importance.Han etc. utilize silicone rubber membrane perstraction method to process containing the phenol trade effluent, have obtained Separation and Recovery effect preferably.Domestic, Xiao Min etc. utilize homogeneous silicone rubber membrane extraction phenol-water solution, and mass transfer process and the mechanism of this technology have been carried out deeply probing into; Wu Lili etc. utilize homogeneous membrane perstraction method to process High Concentration Aniline Wastewater, and the aniline clearance is up to more than 97%.In addition, adopt in the research report of this technical finesse organic waste water, the report of in addition trichloronitrobenzene waste water, 3,4-DCA waste water, tetrachloroethylene waste water etc. being processed, but not yet useful silicone rubber membrane perstraction is processed the relevant report of phenylformic acid waste water.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art part, benzoic effective ways in a kind of recovery trade effluent are provided.
Purpose of the present invention can be by realizing by the following technical solutions:
A kind of from phenylformic acid waste water the method for recovery of benzoic acid, it is characterized in that comprising the steps:
(1) spiraled in reactor by supporter supports the silicone rubber membrane pipe, make wound form silicone rubber membrane contactor, alkaline extraction liquid is distributed in the outer reactor of silicone rubber membrane pipe;
(2) acid adding is regulated the pH to 1-2 of phenylformic acid waste water;
(3) will regulate phenylformic acid waste water after pH through peristaltic pump under 20-60 ℃, the condition of flow velocity 2.2-4.4mL/min, flow at the silicone rubber membrane pipe internal recycle of above-mentioned wound form silicone rubber membrane contactor, start electric stirring simultaneously and make to see through the silicone rubber membrane pipe to enter into the phenylformic acid of alkaline extraction liquid dispersed.
In circulating process, the phenylformic acid in waste water constantly sees through silicone rubber membrane and enters into alkaline extraction liquid, and other ionic species can't see through, thereby realize benzoic Separation and Recovery.The phenylformic acid that enters into alkaline extraction liquid exists with the form of benzoate, can be by after the extraction liquid acidifying by obtaining, obtaining phenylformic acid.
Above-mentioned alkaline extraction liquid is not particularly limited, but preferably uses sodium hydroxide or potassium hydroxide solution.
Beneficial effect of the present invention is:
(1) use method of the present invention, the benzoic rate of recovery can reach more than 90%, the phenylformic acid purity reclaimed is high, can recycle aborning, to economizing on resources, alleviate the environmental protection pressure of enterprise, increase economic efficiency significant, be worth applying in the wastewater treatment of chemical industry, food and medicine industry.
(2) the present invention does not use chemical reagent and additive, and the pollution that product is subject to is little, and treatment scale is changeable, but serialization also can intermittently carry out, technique is simple, easy to operate, is easy to automatization and controls.
(3) waste water after wound form silicone rubber membrane perstraction phenylformic acid, owing to having eliminated the antibacterial substance phenylformic acid, therefore can effectively utilize biological method to be processed.
The accompanying drawing explanation
Fig. 1 is FB(flow block) of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but limit the present invention never in any form.
(1) design wound form silicone rubber membrane contactor
By the silicone rubber membrane pipe (by 30wt% Hypatmism type SiO
2form internal diameter 3mm, external diameter 4mm, length 11.9m with 70wt%PDMS) spiraled in the 5L glass reactor by supporter supports, make wound form silicone rubber membrane contactor.
(2) recovery of benzoic acid
As shown in Figure 1, add the NaOH solution as the 10wt% of alkaline extraction liquid in the above-mentioned glass reactor 7 that wound form silicone rubber membrane contactor is housed, starting 6 pairs of these NaOH solution of electric mixer is stirred, the rotating speed of electric mixer 6 is made as 250rpm, by peristaltic pump 3, the alkaline extraction liquid of glass reactor 7 bottoms is recycled to the top of glass reactor 7 to promote uniform liquid simultaneously.Also be provided with thermometer 5 in this external glass reactor 7 to measure temperature.By 1L phenylformic acid simulated wastewater (concentration of benzoic acid 3g/L, pH is adjusted to 1.5) pour feed liquid storage tank 1 into, under room temperature, the phenylformic acid simulated wastewater is pumped into the silicone rubber membrane pipe 2 of above-mentioned wound form silicone rubber membrane contactor with flow velocity 2.2mL/min through peristaltic pump 4 from feed liquid storage tank 1, and cycling stream is got back to feed liquid storage tank 1.Along with the benzoic NaOH solution that sees through the appropriate 10wt% of supplementing in glass reactor 7, to maintain its pH value.After operation 156h, the extraction liquid sample is analyzed, in extraction liquid, benzoic acid content is 2.895g.
Be adjusted to 1.5 except the concentration of benzoic acid by the phenylformic acid simulated wastewater is made as 2g/L(pH), be made as working time beyond 160h, other is similarly to Example 1.The extraction liquid sample is analyzed, and in extraction liquid, benzoic acid content is 1.894g.
Claims (2)
1. the method for a recovery of benzoic acid from phenylformic acid waste water, is characterized in that comprising the steps:
(1) spiraled in reactor by supporter supports the silicone rubber membrane pipe, make wound form silicone rubber membrane contactor, alkaline extraction liquid is distributed in the outer reactor of silicone rubber membrane pipe;
(2) acid adding is regulated the pH to 1-2 of phenylformic acid waste water;
(3) will regulate phenylformic acid waste water after pH through peristaltic pump under 20-60 ℃, the condition of flow velocity 2.2-4.4mL/min, flow at the silicone rubber membrane pipe internal recycle of above-mentioned wound form silicone rubber membrane contactor, start electric stirring simultaneously and make to see through the silicone rubber membrane pipe to enter into the phenylformic acid of alkaline extraction liquid dispersed.
2. the method for claim 1, is characterized in that alkaline extraction liquid is used sodium hydroxide or potassium hydroxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310295828XA CN103435475A (en) | 2013-07-15 | 2013-07-15 | Method for recycling benzoic acid from benzoic acid waste water |
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|---|---|---|---|
| CN201310295828XA CN103435475A (en) | 2013-07-15 | 2013-07-15 | Method for recycling benzoic acid from benzoic acid waste water |
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| CN201310295828XA Pending CN103435475A (en) | 2013-07-15 | 2013-07-15 | Method for recycling benzoic acid from benzoic acid waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865828A (en) * | 2017-04-01 | 2017-06-20 | 来安县万博丰环保科技有限公司 | A kind of method of recovery of benzoic acid in waste water from benzoic acid |
| CN106928050A (en) * | 2017-04-01 | 2017-07-07 | 来安县万博丰环保科技有限公司 | A kind of melting benzoic acid tower for refining high-purity benzene formic acid |
-
2013
- 2013-07-15 CN CN201310295828XA patent/CN103435475A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 杜飞: "高盐水杨酸废水的膜萃取生物降解特性研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865828A (en) * | 2017-04-01 | 2017-06-20 | 来安县万博丰环保科技有限公司 | A kind of method of recovery of benzoic acid in waste water from benzoic acid |
| CN106928050A (en) * | 2017-04-01 | 2017-07-07 | 来安县万博丰环保科技有限公司 | A kind of melting benzoic acid tower for refining high-purity benzene formic acid |
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Application publication date: 20131211 |