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Bleached lac particle recovering method

A technology for bleaching shellac and a recovery method, which is applied in the field of recovering shellac particles, can solve the problems such as the inability to increase the mesh number of the filtering wire without limit, increase the investment in fixed assets and the floor space, and reduce the filtering efficiency, and the method is simple. Fast, resource-saving, high-yield and production-efficiency effects

Inactive Publication Date: 2013-01-23
THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the mesh number of the filter mesh will make it difficult to filter the glue solution and reduce the filtration efficiency, and the mesh number of the filter mesh cannot be increased without limit, and some smaller bleached shellac particles will always enter the filtrate; The large clarifier will not only increase the investment in fixed assets and occupy an area, but also the particles of bleached lac particles will gradually lose water as time goes on, and their particle density will gradually decrease or even be smaller than the density of water, so they cannot be separated from the clarification and settlement. Water and liquid separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) The waste liquid collected in the buffer tank is transported through the heat exchanger by a high level difference, the waste liquid continuously flows into the clarification tank, and the heating temperature of the waste liquid is controlled between 45-50 ℃. In the liquid, the bleached shellac particles are softened by heat, and under the action of thermal motion, they coalesce into larger particles in the clarification tank, accelerating the sedimentation and separation of the particles and the liquid;

[0043] The heat exchanger used in this embodiment is a double-pipe heat exchanger using hot water as a heat source. In addition, jacketed heat exchangers, tube heat exchangers, plate heat exchangers, spiral plate heat exchangers, immersed heat exchangers or volumetric heat exchangers can also be used. The heat source used in the heat exchanger removes hot water In addition, it can also be steam or heat carrier oil.

[0044] 2) After settling for 20 minutes, collect the...

Embodiment 2

[0051] 1) The waste liquid collected in the buffer tank is transported into the clarification tank with the same amount of waste liquid as in Example 1 by means of a pump, and the waste liquid in the clarification tank is directly heated by an electric heating rod (resistance component). When the temperature reaches 55 When ~60℃, stop heating.

[0052] In the heated waste liquid, the bleached shellac particles are softened by heat, and under the action of thermal motion, they coalesce into larger particles in the clarification tank, accelerating the sedimentation and separation of the particles and the liquid.

[0053] 2) After settling for 20 minutes, collect the dense phase at the bottom outlet of the clarification tank and enter the centrifuge for further dehydration to obtain wet bleached shellac particles. The supernatant of the clarification tank is filtered and sent to the sewage treatment station.

[0054] According to the above method, 10m 3 The average amount of bleached sh...

Embodiment 3

[0060] 1) The waste liquid collected in the buffer tank is transported with the same amount of waste liquid as in Example 1 through a sleeve heat exchanger to heat the waste liquid by means of a pump, and the heating temperature of the waste liquid containing bleached shellac particles is controlled at 45~ Between 50°C, the heated waste liquid is sent to the hydrocyclone to separate the larger bleached shellac particles in the waste liquid;

[0061] 2) The waste liquid processed by the hydrocyclone is sent to the clarification tank for static settlement;

[0062] 3) After settling for 20 minutes, collect the dense phase at the bottom of the clarification tank and make it enter the centrifuge for further dehydration to obtain wet bleached shellac particles; filter the supernatant of the clarification tank and send it to the sewage treatment station.

[0063] According to the above method, 10m 3 The average amount of bleached shellac particles (absolutely dry) recovered from the waste ...

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Abstract

The invention discloses a bleached lac particle recovering method, which comprises the following step: heating waste liquor for washing bleached lac to make bleached lac particles aggregated and sedimented and separated from the liquid so as to obtain the bleached lac particles and clear liquid. The method has simple process, reduces the loss of the bleached lac particles, improves the yield of the bleached lac, and reduces the load of treating the subsequent sewage.

Description

Technical field [0001] The invention relates to a method for producing bleached shellac, in particular to a method for recovering shellac particles from the waste liquid of the bleached shellac production process. Background technique [0002] Shellac is a pure natural resin secreted by lac insects living on host plants. It has the characteristics of strong adhesion, insulation, moisture resistance, smooth coating film, translucent, etc., and is non-toxic and tasteless. It is an important industrial raw material and is widely used. Used in military industry, electronics, medicine, food and chemical industries, it has important economic value. [0003] Because shellac contains red shellac which is difficult to remove and can be dissolved in almost all shellac resins, the product is yellow or even brown. In industries such as papermaking, food and furniture manufacturing, light-colored shellac resin products are often needed, and shellac needs to be decolorized. Therefore, red shell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09F1/00C02F9/10C02F1/02C02F1/38C02F1/52
Inventor 张弘郑华陈晓鸣石雷甘瑾马李一
Owner THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY