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Pipelined continuous preparation method and device of triisoamyl phosphate for spent fuel post-treatment

A technology for preparing triisoamyl phosphate and a device, which is applied in the direction of using atmospheric pressure to chemically change substances, chemical instruments and methods, and pressure vessels used in chemical processes, which can solve problems such as high process risk and achieve Improve the reaction yield, the process is less dangerous, and realize the effect of continuous industrial production

Active Publication Date: 2021-01-15
HANGZHOU JINGYE INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In this reaction, oxygen and combustible phosphorus react together, the reaction temperature needs to be strictly controlled, the process is dangerous, and it is not suitable for industrial scale-up

Method used

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  • Pipelined continuous preparation method and device of triisoamyl phosphate for spent fuel post-treatment
  • Pipelined continuous preparation method and device of triisoamyl phosphate for spent fuel post-treatment
  • Pipelined continuous preparation method and device of triisoamyl phosphate for spent fuel post-treatment

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preparation example Construction

[0060] The embodiment of the present invention proposes a method for preparing triisoamyl phosphate for spent fuel reprocessing, comprising the following steps:

[0061] S1. Mix trimethyl phosphate and isoamyl alcohol evenly to obtain a mixed solution.

[0062] Specifically, trimethyl phosphate and isoamyl alcohol are mixed evenly at a molar ratio of 1:3~6.

[0063] S2. Heating the mixed solution under a protective gas environment of 2.5-10 MPa to obtain a reaction solution; wherein the heating temperature is 150-250° C.

[0064] Specifically, the heating time is 60-150 minutes.

[0065] S3. Distilling the reaction solution under reduced pressure to obtain triisoamyl phosphate.

[0066] Compared with the prior art, in the preparation method of triisoamyl phosphate used in the reprocessing of spent fuel provided by the embodiment of the present invention, the by-product methanol will not react with triisoamyl phosphate, and no solvent is needed during the reaction With the p...

Embodiment 1

[0095] S1. Preparation before preparation: Mix trimethyl phosphate and isoamyl alcohol evenly according to the molar ratio of 1:3 and then add the mixed liquid storage tank; close the first liquid outlet switch, open the intake switch, and fill the reaction coil with nitrogen to When the first pressure gauge shows that the pressure is 4MPa, close the intake switch; adjust the temperature of the constant temperature oil bath to 150°C, and wait for the temperature indication to stop changing.

[0096] S2. Preparation of triisoamyl phosphate: turn on the feed switch, the plunger metering pump pumps the mixed solution into the reaction coil at 0.5mL / min, and the transesterification reaction of trimethyl phosphate and isoamyl alcohol occurs in the reaction coil , to obtain the reaction solution. Then the reaction solution enters the high-pressure buffer tank from the upper part of the inner space of the high-pressure buffer tank for temporary storage.

[0097] S3. Continuous produ...

Embodiment 2

[0102] S1. Preparation before preparation: mix trimethyl phosphate and isoamyl alcohol evenly according to the molar ratio of 1:4, and then add the mixed liquid storage tank; close the first liquid outlet switch, open the intake switch, and fill the reaction coil with nitrogen to When the first pressure gauge shows that the pressure is 3.5MPa, close the intake switch; adjust the temperature of the constant temperature oil bath to 180°C, and wait for the temperature indication to stop changing.

[0103] S2. Preparation of triisoamyl phosphate: Turn on the feed switch, and the plunger metering pump pumps the mixed solution into the reaction coil at 0.8mL / min, and the transesterification reaction of trimethyl phosphate and isoamyl alcohol occurs in the reaction coil , to obtain the reaction solution. Then the reaction solution enters the high-pressure buffer tank from the upper part of the inner space of the high-pressure buffer tank for temporary storage.

[0104] S3. Continuou...

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Abstract

The invention provides a preparation device of triisopentyl phosphate. The device comprises: a reaction coil pipe used as a reaction container of a mixed solution; an air source communicated with theinlet of the reaction coil pipe through an air inlet pipe, wherein an air inlet switch is arranged on the air inlet pipe; a heating unit used for heating the reaction coil pipe; a high-pressure buffertank, wherein the upper portion of the space in the high-pressure buffer tank is communicated with the outlet of the reaction coil pipe through a first liquid outlet pipe; a reaction liquid collecting tank communicated with the bottom of the space in the high-pressure buffer tank through a second liquid outlet pipe, wherein a first liquid outlet switch is arranged on the second liquid outlet pipe; a feeding unit used for conveying the mixed solution into the reaction coil pipe; and a first pressure gauge arranged on the high-pressure buffer tank and used for measuring the pressure of the reaction environment. The invention also provides a method for preparing triisopentyl phosphate by adopting the device. According to the invention, continuous industrial production of triisopentyl phosphate is realized, the generated byproduct methanol does not react with triisopentyl phosphate, the yield is high, and the process risk is low.

Description

technical field [0001] The invention relates to the technical field of nuclear industry spent fuel reprocessing, in particular to a pipelined continuous preparation method and a preparation device for triisoamyl phosphate used for spent fuel reprocessing. Background technique [0002] The Purex process (Purex process) is currently the most widely used process in the spent fuel reprocessing of the nuclear industry. This process uses solvent extraction to extract uranium and plutonium from the spent fuel solution. Among them, the most commonly used extraction system is a mixture of tributyl phosphate (TBP) and diluent. However, in the process of using the TBP extraction system to treat spent fuel, TBP cannot well resist α-induced degradation in a high-plutonium environment, and TBP will also undergo a salt-forming reaction with nitric acid during the acidification process, and the increase in ionic strength will The solubility of TBP is reduced, leading to the formation of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/11B01J3/04
CPCB01J3/042C07F9/11
Inventor 田利刚金杰峰刘习文
Owner HANGZHOU JINGYE INTELLIGENT TECH CO LTD
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