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A method and equipment for deamination and recovery of propylene oxide and propylene in a propylene oxide plant

A technology for propylene oxide and deamination, which is used in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., and can solve the requirements of continuous circulation, waste of propylene oxide, and negative pressure devices on equipment and pipeline systems It can reduce the generation of waste water and increase the anti-blocking performance.

Active Publication Date: 2018-05-01
南京佳华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And because it also contains propylene oxide with higher concentration, the use of direct washing with more than 50% concentration of propylene to release air will waste a large amount of high value-added propylene oxide
Therefore, the method provided by this invention patent application is more suitable for the non-condensable gas whose propylene concentration reaches over 50% after negative pressure multi-stage low-temperature condensation in the negative pressure recovery tower, but the biggest problem brought by the negative pressure is that there are many system equipments, Moreover, it occupies a very large area and consumes a lot of energy. At the same time, low-temperature condensation is required to recover propylene oxide. In the process of direct low-temperature condensation recovery, harmful substances such as propionaldehyde have a higher boiling point than propylene oxide, and impurities cannot be discharged from the system during the condensation process. And the problem of constant circulation, and the negative pressure system also needs to be equipped with vacuum equipment and supporting return storage tanks. For the negative pressure operation of flammable and explosive devices, once the air leaks inhaled, it is easier to reach the explosion limit and cause explosion hazards, so Negative pressure device has high requirements on equipment and piping system

Method used

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  • A method and equipment for deamination and recovery of propylene oxide and propylene in a propylene oxide plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Get propylene oxide mixed gas (i.e. propylene oxide releases air), the main components are as follows: propylene oxide 75wt%, propylene 22wt%, ammonia 3wt%, with a flow rate of 2m 3 / h into the deamination adsorption tower 1, from top to bottom through 3A molecular sieve (the diameter of the 3A molecular sieve packing layer is 200mm, the length is 1000mm) for adsorption deamination, adsorption temperature 40 ℃, adsorption pressure 0.12MPa, the gaseous material after deamination is discharged from the outlet at the bottom of the deamination adsorption tower, the ammonia concentration in the material is reduced to 308ppm, and the deamination rate is 98.9%.

Embodiment 2

[0049] Take propylene oxide mixed gas, the main components are as follows: propylene oxide 75%wt, propylene 22%wt, ammonia 3%wt, with a flow rate of 2m 3 / h into the deamination adsorption tower 1, from top to bottom through the MgO-3A molecular sieve modified by MgO (molecular sieve filling diameter 200mm, length 1000mm) for adsorption deamination, adsorption temperature 40 ℃, adsorption pressure 0.12MPa, after deamination The gaseous material is discharged from the discharge port at the bottom of the deammonization adsorption tower, the ammonia concentration in the material is reduced to 153ppm, and the deammonization rate is 99.49%.

[0050] Wherein, MgO content is 5wt% in the MgO-3A molecular sieve, and MgO-3A molecular sieve is made by the following method: get 3A molecular sieve 10g, the Mg(NO of 0.4mol / L 3 ) 2 ·6H 2 O solution 35mL, impregnated 3A molecular sieve in Mg(NO 3 ) 2 ·6H 2 In O solution, ultrasonically oscillate for 2h, filter, and dry the precipitate at...

Embodiment 3

[0052] Take propylene oxide mixed gas, the main components are as follows: propylene oxide 75wt%, propylene 22wt%, ammonia 3wt%, with a flow rate of 2m 3 / h into the deammonization adsorption tower 1, passing through SiO from top to bottom 2 -3A molecular sieve (molecular sieve filling diameter 200mm, length 1000mm) for adsorption deamination, adsorption temperature 40 ℃, adsorption pressure 0.12MPa, the gaseous material after deamination is discharged from the outlet at the bottom of the deamination adsorption tower, and the ammonia concentration in the material is reduced To 112ppm, the deamination rate is 99.63%.

[0053] Among them, SiO 2 SiO in -3A molecular sieve 2 Content is 5wt%, SiO 2 -3A molecular sieve is prepared by the following method: take 10g of 3A molecular sieve, add 55mL of cyclohexane at 35°C, and then add 5mL of Si(OCH 3 ) 4 Impregnated at 35°C, ultrasonically oscillated for 2h, filtered, dried at 120°C for 24h, heated to 550°C under nitrogen protecti...

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Abstract

The invention discloses a method for deaminizing and recycling propylene oxide (PO) and propylene in a PO device. The method comprises the following steps: adsorbing and deaminizing: introducing raw materials into a deaminizing and adsorbing tower, adsorbing and deaminizing by an adsorbent from top to bottom and enabling the deaminized materials to enter a PO rectifying tower; analyzing and reproducing the adsorbent and enabling the analyzed tail gas to enter a tail gas treatment tower; rectifying the deaminized material in the PO rectifying tower, discharging the obtained PO from the bottom of the PO rectifying tower, discharging a tower top light component from the top of the tower, condensing the tower top light component and performing liquid-phase reflux to enter the PO rectifying tower, and enabling the noncondensable gas to enter a propylene recycling tower; and absorbing the gas which enters the propylene recycling tower by an absorbent to remove impurities from the gas and obtain the gas with the propylene content being not less than 98%. The invention also discloses the equipment for deaminizing and recycling the PO and the propylene in the PO device. According to the method and the equipment, the deaminizing method is simple, inorganic ammonia can be removed by 98% or above, and all the PO and the propylene byproducts can be recycled.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a method and equipment for refining and removing impurities from propylene oxide in chlor-alkali chemical industry, in particular to a method and equipment for deamination and recovery of propylene oxide and propylene in a propylene oxide device, especially to an environmental A method and equipment for deamination of propylene oxide vent gas and recovery of propylene oxide and propylene or a method and equipment for deamination of liquid propylene oxide products. Background technique [0002] In recent years, the domestic production capacity of propylene oxide (PO) is 3 million tons per year, and the demand is expanding at a growth rate of 5-10% every year. PO is the third largest propylene derivative except polypropylene and acrylonitrile. It is an important basic organic chemical synthesis raw material, mainly used for the production of polyether, propylene glycol, etc. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/32C07D303/04C07C7/00C07C11/06
CPCC07C7/005C07D301/32C07D303/04C07C11/06
Inventor 谢佳华任晓乾石杨夏艳高云山王健钮跟跟贾涛王伟伟刘俊千钱皓
Owner 南京佳华科技股份有限公司