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Method for producing aqueous urea and method for removing and recovering triuret from aqueous urea

A manufacturing method and technology of urea water, applied in separation methods, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as difficult to obtain high-purity urea water

Inactive Publication Date: 2016-03-30
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, it is found that it is difficult to obtain high-purity urea water only by passing urea water through ion exchange resins.

Method used

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  • Method for producing aqueous urea and method for removing and recovering triuret from aqueous urea
  • Method for producing aqueous urea and method for removing and recovering triuret from aqueous urea
  • Method for producing aqueous urea and method for removing and recovering triuret from aqueous urea

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Embodiment

[0043] Hereinafter, the urea water production method, the triuret removal method, and the triuret recovery method according to the above-mentioned embodiments were actually carried out, and their effects were confirmed. It will be specifically described below.

[0044] Confirmation of triuret

[0045] First, 365 kg of urea was put into a 1000 mm long, 900 mm wide, and 1150 mm deep plastic container (hereinafter referred to as "stirring tank") equipped with a stirring pump inside.

[0046] Next, the ion-exchange resin mixed with 66% of anion resin regenerated into OH type with NaOH and 34% of cation resin regenerated into H type with HCI (both produced by Dow Chemical Company) is filled to a height of 900mm, diameter 1123 kg (1030 liters) of 32.5% by weight urea water was produced by passing 758 liters of tap water at a flow rate of SV=20 in a 200 mm column (hereinafter simply referred to as "column") and stirring for 90 minutes.

[0047] Then, when the water temperature of t...

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Abstract

Provided are a method for effectively removing triuret from aqueous urea, a method for producing high purity aqueous urea, and a method for recovering triuret from aqueous urea. To this end, the method for producing aqueous urea comprises a step of dissolving aqueous urea in water to form aqueous urea, a step of bringing the aqueous urea to a temperature in a range of 17 DEG C or less to 5 DEG C or more to make the aqueous urea cloudy, and a step of passing the clouded aqueous urea through an ion exchange resin. The present invention is also a method for removing and recovering triuret from aqueous urea, the method comprising a step of cooling aqueous urea that includes urea and triuret as an impurity to a temperature range of 17 DEG C or less to 5 DEG C or more to deposit triuret and make the aqueous urea cloudy, and a step of passing the aqueous urea through an ion exchange resin in said temperature range in a state where the aqueous urea is clouded, and allowing the ion exchange resin to capture the deposited triuret.

Description

technical field [0001] The invention relates to a method for manufacturing urea water, a method for removing triuret from urea water, and a method for returning triuret from an aqueous solution. Background technique [0002] Urea water is used to purify NO X (nitrogen oxide) technology, and is used in the exhaust gas purification system of large vehicles, etc. The exhaust gas purification system utilizes ammonia (NH 3 ) and nitrogen oxides (NO X ) undergoes a chemical reaction and is reduced to nitrogen (N 2 ) and water (H 2 O) properties, but it is difficult to directly load ammonia into a car for safety reasons, so urea water is usually used. [0003] As the technology related to the above-mentioned urea water, there are, for example, the following Patent Document 1 and the following Patent Document 2. Patent Document 1 below discloses a method for producing high-purity urea water in which a urea water stock solution is treated with an acidic cation exchange resin an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/14C07C275/00
CPCC07C273/14B01D15/361C07C275/00B01D53/92B01D2251/2067
Inventor 猪野荣一
Owner OPTY