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Process for reclaiming polymer

A recovery method and polymer technology, applied in the direction of spray evaporation, etc., can solve the problems of not being able to control the water vapor ratio at the same time, being unsuitable, increasing costs, etc.

Inactive Publication Date: 2004-06-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of a condenser, the oxygen concentration in the circulation system and the water vapor ratio at the inlet of the spray dryer cannot be controlled at the same time, so it is not suitable
[0008] In addition, when spray drying with a closed cycle is used, it is necessary to condense the moisture in the same amount as the moisture that has been dried in the dryer by the condenser. As the amount of drying with the dryer increases, the amount of condensation in the condenser increases. The condenser and its ancillary equipment (refrigerant manufacturing equipment, etc.) must be large-scale devices, so it is not suitable
[0009] In JP-A No. 60-110301, a method for controlling oxygen concentration and circulating gas pressure using a gas circulation spray drying device is proposed, but N must be supplied. 2 , thus increasing the generated N 2 The cost of gas is not suitable

Method used

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  • Process for reclaiming polymer
  • Process for reclaiming polymer

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Experimental program
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Embodiment 1

[0064] With the process shown in Figure 1, the polymer powder was recovered with the following equipment.

[0065] As the spray dryer 1, the inner diameter of the straight part was 3.5 m, the height of the straight part was 4 m, and the height of the conical part was 2.8 m. On the micronization device 7, a rotating disc (15,000 revolutions per minute) was used.

[0066] Condenser 2 uses a multi-tube condenser with baffles consisting of a heat exchange length of 1.0m, a baffle interval of 0.184m, a heat exchanger outer diameter of 0.31m, a heat exchange single tube outer diameter of 0.026m, and a single tube number of 66. device.

[0067] The composition (% by weight) of the polymer emulsion used in the spray dryer is: methyl methacrylate 84%, butyl acrylate 16%, n-octyl mercaptan 0.0057%, wherein the solid ratio (% by weight) is 37.8% . The minimum film-forming temperature of the polymer emulsion is 66°C. The polymer emulsion was sent to the spray drying device 1 at a rate...

Embodiment 2

[0084]In addition to changing the temperature of the inlet portion 8 and the air flow rate of the dryer, and making the temperature of the outlet portion 23 of the spray dryer 1 100°C (15°C or more higher than the minimum film-forming temperature of the polymer emulsion 1 of 66°C), By operating under the same conditions as in Example 1, 32.1 kg / h of polymer powder could be recovered from the powder outlet 9 and the powder recovery device 11 consisting of a cyclone and a bag filter.

[0085] Adopt the polymer recovery method of the present invention, because the oxygen concentration in the circulation system can be controlled to be a low value, and there are few polymers attached to the outlet portion 23 of the spray dryer, and the condenser can use an inexpensive small-sized device, so it can be used in The spray dryer 1 safely, stably, and cheaply produces solids that can be oxidized automatically.

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Abstract

The invention provides a polymer recovery method, wherein the polymer powder is separated and reclaimed from a part of the polymer emulsion to feed to the condenser for moisture condensation, then it is led into the straight flame heating installation for heating and re-circulation. The also provides a polymer recovery method by using small-sized condenser.

Description

technical field [0001] The invention relates to a spray drying process for recovering polymer powder from polymer emulsion. technical background [0002] In the method for recovering the polymer powder from the polymer emulsion, the process of directly spray-drying the polymer emulsion in hot air is adopted. [0003] The process of directly spraying the polymer emulsion in hot air can simplify the process because the dry powder can be obtained directly from the polymer emulsion after polymerization. From the perspective of equipment cost and operation management, it is an industrially better process. . Spray drying can be done in open cycle or closed cycle. [0004] In the open cycle, the heated gas used to dry the polymer emulsion recovers the polymer from the polymer emulsion in the form of powder, and then discharges the dryer into the atmosphere. The energy loss of venting the hot gas into the atmosphere is significant, and the adverse impact on the environment is als...

Claims

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Application Information

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IPC IPC(8): B01D1/16C08F2/22
Inventor 白水大辅鸟谷明弘面手昌树
Owner MITSUBISHI CHEM CORP