Coagulation method of ABS grafted latex for improving biodegradability of process sewage

An agglomeration method and biochemical technology, applied in the coagulation field of ABS grafted latex, can solve the problems of high efficiency/economy of the treatment process, rising cost per ton of sewage treatment, etc., to reduce the content of toxic cyano substances and improve biochemical properties the effect of narrow particle size distribution

Active Publication Date: 2021-09-21

WANHUA CHEM (SICHUAN) CO LTD +1

13 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

It is worth pointing out that with the complexity of the treatment process, the cost per ton of sewage treatment...

Method used

As can be seen from the above test results, the present invention introduces a pH buffering agent in the coagulation process, which can realize a certain degree of regulation and control to the selectivity of the residual monomer acrylonitrile hydration reaction, and more target products ...

Abstract

The invention discloses a coagulation method of ABS grafted latex for improving biodegradability of process sewage. The method comprises the following steps: 1) adding ABS grafted latex, deionized water, a coagulant and a pH buffer agent into a coagulation kettle, and performing demulsifying and coagulating to obtain ABS grafted powder slurry; and 2) introducing the ABS grafted powder slurry into a curing kettle for further curing, and performing cooling, filtering and drying to obtain an ABS rubber powder. According to the method, the ABS grafted powder can be conveniently and efficiently prepared through continuous coagulation, meanwhile, control over the variety/content of specific pollutants can be achieved, generated process sewage has the higher B/C value, and the method is more suitable for an existing sewage treatment process of flocculation-air flotation slag scraping-biochemical treatment.

Technology Topic

ChemistryPollutant +8

Image

Examples

Experimental program(5)
Comparison scheme(2)

Example Embodiment

[0048] Example 1

[0049] Take ABS graft latex (317 nm, solids 40.8%) 26kg, add 100 g of emulsion antioxidants (Zhejiang Shaofeng Plastic Industry SF-50LX), using IKA mechanical stirring mix evenly for use; 318 g of phthalate, potassium hydroxide, 159 g of sulfuric acid and the appropriate amount of deionized water (an addition amount of the target slurry) to adjust deionized water) are mixed, configured to be mixed to be used.

[0050] Nitrogen replacement for three roller continuous agglomeration reactors (see figure 1 In the process flow), the first cohesk is turned on, and the aforementioned consecutive mixed solution is continuously introduced into the kettle. After the liquid level is established, the first condensation kettle is controlled to 74 ° C, and the second condensate is 90 ° C, The three-coated kettle is 85 ° C, and the exit pump flow control each kettle is 1 h, and the rotational speed of each kettle is adjusted to control the velocity of each kettle line is 5m / s, 4m / s, 3 m / s; final system It has a 25% slurry to flow out the reactor.

[0051] Take the above slurry, further cool down to the normal temperature using 300 mesh stainless steel mesh filtration to obtain a humidified graft powder. The fluidized bed dryer was dried at 70 ° C for 1 h, resulting in a graft powder having a water content of 0.58%.

[0052] The process sewage obtained by filtration was tested in the aforementioned method, wherein the cyano group was 1573 ppm and acrylamide was 5238 ppm; and the process waste water BOD5 was 6601 ppm, COD was 11750 ppm, and B / C = 0.56 can be calculated.

[0053] The graft powder obtained by the graft powder was 38.16 μm, D50 was 132.7 μm, and D98 was 415.1 μm, greater than 1.2 mm particle proportional to 1.1%.

[0054] The Hunterlab Ultrascan Vis chromatic parallel is used to further test the pink phase, which is 88.54, and the B value is 2.92.

[0055] figure 2 For the present embodiment, the process sewage feature pollutant GC test spectrum, Figure 4 The particle size distribution of the ABS rubber powder produced in this example.

Example Embodiment

[0056] Example 2

[0057] Take ABS graft cleavage (317 nm, solids 40.8%) 26kg, add 100 g of emulsion antioxidants (Zhejiang Shaofeng Plastic Industry SF-50LX), using IKA mechanical stirring mix evenly for use; 106 g of amino acetic acid, 74 g of phosphoric acid and appropriate amount Deionized water (with the amount of the target slurry is attached to the amount of deionized water) is mixed, and the mixed solution is disposed to be used.

[0058] Nitrogen replacement for three roller continuous agglomeration reactors (see figure 1 In the process of process), the first cohesk is turned on, and the aforementioned mixed solution is continuously introduced into the kettle. After the liquid level is established, the first condensation kettle is controlled to 80 ° C, and the second condensate is 85 ° C, The three-coated kettle is 85 ° C, and the exit pump flow control each kettle is 1 h, and the rotational speed of each kettle is adjusted to control its leaf line speed in turn is 5m / s, 3m / s, 3 m / s; final system It has a 25% slurry to flow out the reactor.

[0059] Take the above slurry, further cool down to the normal temperature using 300 mesh stainless steel mesh filtration to obtain a humidified graft powder. The fluidized bed dryer was dried at 70 ° C for 1 h to give a graft powder having a moisture content of 0.61%.

[0060] The process sewage obtained by filtration was tested in the aforementioned method, wherein the cyano group was 1745 ppm, acrylamide was 4839 ppm; and the process waste water BOD5 was 6154 ppm, COD was 11994 ppm, and its B / C = 0.51 can be calculated.

[0061] The graft powder obtained by the obtained graft powder was 36.53 μm, D50 was 143.4 μm, and D98 was 572.1 μm, and the proportion of 1.6% of> 1.2 mm particles.

[0062] The Hunterlab Ultrascan Vis chromatic parallel was used to further test the pink phase, which was 86.57, and the B value was 3.36.

Example Embodiment

[0063] Example 3

[0064] Take ABS graft latex (317 nm, solids 40.8%) 26kg, add 100 g of emulsion antioxidants (Zhejiang Shaofeng plastic industry SF-50LX), using IKA mechanical stirring mix evenly; 53 g of hexamethylenedicaine, 318 g of hydrochloric acid and the appropriate amount of deionized water (an addition amount of the target slurry) to adjust the amount of deionized water) are mixed, configured to be mixed to be used.

[0065] Nitrogen replacement for three roller continuous agglomeration reactors (see figure 1 In the process flow), the first cohesk is turned on, and the aforementioned mixed solution is continuously introduced into the kettle. After the liquid level is established, the first condensate thermal temperature is 65 ° C, and the second condensate is 90 ° C, The three-condensed kettle is 85 ° C, while adjusting the flow of the outlet pump is 1 h, which is 1 h, adjusting each kettle, and the velocity of each kettle is equal to 5 m / s, 2m / s, 3 m / s, respectively; final system It has a 25% slurry to flow out the reactor.

[0066] Take the above slurry, further cool down to the normal temperature using 300 mesh stainless steel mesh filtration to obtain a humidified graft powder. The fluidized bed dryer was dried at 70 ° C for 1 h to give a graft powder having a moisture content of 0.35%.

[0067] The process sewage obtained by filtration was tested in the aforementioned method, wherein the cyano group was 1972 ppm, acrylamide was 4728 ppm; while the process waste water BOD5 was 5633 ppm, COD was 11807 ppm, and it can be calculated to be calculated to have its B / C 0.48.

[0068] The obtained graft powder was 53.2 μm, D50 was 164.7 μm, and D98 was 683.4 μm, and the proportion of> 1.2 mm particles was 3.2%.

[0069] The Hunterlab Ultrascan Vis chromatography was used to further test the pink phase, the L value was 85.88, and the B value was 4.72.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

Improved biodegradability

Coagulation method of ABS grafted latex for improving biodegradability of process sewage

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Integrated sewage treatment device suitable for rural sewage

Biodegradable material and method for producing biodegradable material

Leather wastewater treatment system and method

Technical process for treating air conditioner coating waste water

Cattle hair keratin modified oily polyurethane film preparation method

Classification and recommendation of technical efficacy words

Electrolysis unit with membrane filtration function

Biodegradable material and method for producing biodegradable material

Cattle hair keratin modified oily polyurethane film preparation method

Technical process for treating air conditioner coating waste water

Leather wastewater treatment system and method