Demulsification, neutralization and dehydration method of acidic emulsified tar

A treatment method and technology for tar, applied in the field of coal chemical industry, can solve the problems of increased safety risks, equipment corrosion, excessive pressure of the second-stage pump, etc., and achieve the effects of reducing economic losses, avoiding equipment corrosion, and avoiding safety accidents.

Inactive Publication Date: 2012-12-26
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the action of acidic surfactants in tar, tar and water form a stable water-in-oil emulsified tar. The tar has a large water content, as high as 15-50%. There are a series of problems in production: the pressure of the second-stage pump exceeds the standard, equipment corrosion affects product quality, increases safety risks, and greatly increases energy consumption
200710176351.8 provides a demulsifier, which is a polyether compound obtained by alkoxylation of a polyamide-amine compound and an epoxy compound. However, only crude oil has been demulsified, and acid emulsified tar may not be applicable
Even if it is the same emulsification of coal tar, due to the different reasons and mechanisms of emulsification, the chemical demulsification method cannot be simply used for reference.

Method used

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  • Demulsification, neutralization and dehydration method of acidic emulsified tar
  • Demulsification, neutralization and dehydration method of acidic emulsified tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Chemical demulsification and dehydration: such as figure 1 As shown, the equipment for chemical demulsification includes a tar tank 5 and a tar circulation pump 4, and a loop is formed between the tar circulation pump and the tar tank; the demulsifier tank 1, the metering pump 2 and the check valve 3 are connected to the tar circulation pump 4 inlet in turn .

[0033] 1500 parts of acid emulsified tar with a water content of 23.9% in the tar tank 5 was heated to 70°C. Dilute the demulsifier A and prepare a 30 wt% aqueous solution in the demulsifier tank 1. The tar is circulated, and the circulation pump 4 has a flow rate of 100 parts / h. Open metering pump 2 and check valve 3, and add demulsifier into the circulation pipeline. The flow rate of the metering pump 2 is 0.1 part / h, and the addition time is 25 hours. After all the demulsifiers are added, continue to beat the cycle for 3 hours. The addition ratio of the demulsifier is 500ppm (parts by weight).

[003...

Embodiment 2

[0041] Equipment is with embodiment 1.

[0042](1) Heat 1500 parts of acid emulsified tar with a water content of 23.9% in the tar tank 5 to 80°C. Dilute the demulsifier B and prepare a 25 wt% aqueous solution in the demulsifier tank 1. The tar is circulated, and the circulation pump 4 has a flow rate of 150 parts / h. Open the metering pump 2 and check valve 3 of the demulsifier, and add the demulsifier into the circulation pipeline. The flow rate of metering pump 2 is 0.2 parts / h, and the addition time is 15 hours. After adding all the demulsifiers, continue to beat the cycle for 10h. The addition ratio of the demulsifier is 500ppm. The tar was heated to 94°C. After the cycle is over, the rest time is 30h. When the tar is transported, the moisture content of the tar is analyzed at 3% to 4% in different time periods.

[0043] (2) The tar after preliminary dehydration is pressurized 0.3MPa by the first-stage pump 6, and the flow rate is 15 parts / h, and 15% Na is added at ...

Embodiment 3

[0045] Equipment is with embodiment 1.

[0046] (1) Heat 1500 parts of acid emulsified tar with a water content of 15% in the tar tank 5 to 90°C. Dilute the demulsifier B and prepare a 20 wt% aqueous solution in the demulsifier tank 1. The tar is circulated, and the circulation pump 4 has a flow rate of 200 parts / h. Open the metering pump 2 and check valve 3 of the demulsifier, and add the demulsifier into the circulation pipeline. The flow rate of the metering pump 2 is 0.3 parts / h, and the addition time is 10 hours. After adding all the demulsifiers, continue to beat the cycle for 15 hours. The addition ratio of the demulsifier is 400ppm. The tar was heated to 96°C. After the cycle, the rest time is 36h. When the tar is transported, the tar moisture is analyzed at 1% to 2% in different time periods.

[0047] (2) The tar after preliminary dehydration is pressurized 0.4MPa by the first-stage pump 6, and the flow rate is 20 parts / h, and 15% Na is added at the inlet of th...

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Abstract

The invention provides a demulsification, neutralization and dehydration method of acidic emulsified tar. A certain proportion of demulsification agent, such as a nonionic surfactant, is added to the acidic emulsified tar for mixing, stirring, heating and standing to change performances of an tar-water interface and ensure that water drops in the W/O type emulsified tar are condensed, thereby achieving preliminary demulsification and preliminary separation of the tar from water; alkali is added for neutralization; waste heat of heat conduction oil for producing modified pitch is used to heat the preliminarily demulsified tar to 110-140 DEG C; pressure is increased to 0.2-0.4Mpa; the tar is subjected to flash evaporation and dehydration in a primary evaporator; the moisture is further reduced; the tar is neutral; and the dehydrated tar is prepared for use and can satisfy the distillation production.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to the chemical demulsification and heating pressure demulsification treatment technology of acid emulsified tar. Background technique [0002] Due to the action of acidic surfactants in tar, tar and water form a stable water-in-oil emulsified tar. The tar has a large water content, as high as 15-50%. A series of problems occurred in production: the pressure of the second-stage pump exceeded the standard, and the equipment was corroded, which affected product quality, increased safety risks, and greatly increased energy consumption. [0003] At present, the tar processing technology is suitable for tar water content ≤ 3.0% after primary dehydration, and tar water content of about 0.5% after final dehydration by a first-stage evaporator. Once the raw material tar moisture is higher than 3.0%, there will be phenomena such as low tar temperature in the first stage, excessive pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/00C10C1/02
Inventor 杜亚平吴其春陈年连
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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