Method for treating waste water in production of para-hydroxyphenyl hydantoin

A technology of p-hydroxybenzene hydantoin and a treatment method, which is applied in water/sewage treatment, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc., can solve the problem of high equipment requirements, high energy consumption of vacuum distillation, and increased treatment Cost and other issues, to achieve the effect of low pharmaceutical costs and operating costs, good environmental benefits, and good pretreatment effects

Inactive Publication Date: 2006-12-27
NANJING UNIV
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the above-mentioned treatment method has lengthy process, cumbersome process and high cost. Specifically, it has the following disadvantages: ① vacuum distillation has high energy consumption and high requirements for equipment, and professional training must be carried out to operators, which will undoubtedly increase Treatment cost; ②Extraction is indeed a technology for treating phenol-containing wastewater, but there are strict requirements for the selection of extractant, that is, it must meet the requirements of non-toxicity, good chemical stability, easy recovery, and low price. The treatment effect of low-concentration phenol-containing wastewater is better, and it can only be used as a pretreatment method for high-concentration phenol-containing wastewater. The above extraction uses two-stage extraction to achieve a certain pretreatment effect. The process is complicated and increases the treatment cost. The back-extraction of the post-organic phase also has to be considere

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First, add solid sodium sulfate to the phenol-containing mother liquor wastewater discharged from the production of p-hydroxyphenylhydantoin in an amount of 54g / 100mL(w / v), heat up to 40℃, stir for 35min, stand for 1h, separate the salt After precipitation, the water phase is separated and mixed with the material washing wastewater in the production process of p-hydroxyphenylhydantoin at a volume ratio of 1:3. The mixed solution is adsorbed in series by two columns, and the adsorption flow rate is controlled to 1BV / h. When the adsorption batch capacity reaches 20BV, the adsorption is stopped. The average phenol concentration in the adsorbed water was 3.92mg / L, CODcr=190.08mg / L (chemical oxygen consumption measured using potassium dichromate as the oxidant). Only the first column is desorbed: first configure 6% NaOH solution as a desorption agent, then add about 0.6BV of 6% NaOH solution to the column, heat to 70°C to soak the resin for 0.5h, then turn on the peristaltic pum...

Embodiment 2

[0036] First, add solid sodium sulfate to the mother liquor wastewater discharged from the production of p-hydroxyphenylhydantoin in the amount of 40g / 100mL(w / v), raise the temperature to 60℃, stir for 45min, stand for 1h, and separate the salt. The water phase is separated and mixed with the washing wastewater in a ratio of 1:1 by volume. Control the adsorption flow to 0.1BV / h. When the adsorption batch volume reaches 10BV, the adsorption is stopped, the temperature during desorption is 60°C, the flow rate is 0.1BV / h, and 4% NaOH is selected as the desorption agent. Add hydrochloric acid to adjust the pH of the desorption solution to about 4. Other conditions are the same as in Example 1. The average phenol content of the adsorbed water is 5.56mg / L, and CODcr=261.23mg / L.

[0037] The implementation shows that: solid potassium sulfate has similar effects, but the cost is higher, and the use of sodium chloride or potassium chloride also has similar effects.

Embodiment 3

[0039] First, add solid sodium sulfate in the amount of 42g / 100mL(w / v) to the high-concentration phenol-containing mother liquor wastewater, heat up to 50℃, stir for 50min, stand for 1h, separate the water phase after salting out, It is mixed with washing wastewater in a ratio of 1:3 by volume. Other conditions are the same as in Example 1. The average phenol content of the adsorbed water is 5.17mg / L, CODcr=217.67mg / L (chemical oxygen consumption measured using potassium dichromate as the oxidant).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a disposing method of waste water in the p-hydroxybenzene hydantoin manufacturing course, which comprises the following steps: salting waste water with phenol mother liquid through soluble salt; stewing to divide water-phase; blending salted water phase and waste water according to 1:1-8; adsorbing the composite liquid in the resin adsorbing column under normal temperature at 0.1-2 BV per h flow; desorbing the adsorbed saturated resin; preparing for next adsorbing disposal. The invention removes p-phenolsulfonate by over 99 percent, which doesn't pollute environment.

Description

Technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method in the production of p-hydroxyphenylhydantoin. Background technique [0002] P-Hydroxyphenylhydantoin is an important chemical raw material and pharmaceutical intermediate, mainly used in the biological preparation of D-p-hydroxyphenylglycine. Using glyoxylic acid, urea, and phenol as raw materials, synthesis of p-hydroxyphenyl hydantoin in a certain amount of acidic medium will produce high-concentration phenol-containing wastewater. If it is directly discharged without effective treatment, it will inevitably cause long-term serious pollution to the environment . [0003] At present, only the following methods have been reported in the domestic treatment methods of this production wastewater: distillation-extraction-adsorption process. [0004] The method is to firstly distill the mother liquor wastewater under reduced pressure, combine the distillate and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/00C02F1/58C02F1/28C02F1/42
Inventor 韩永忠储开明马海云李茂
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap