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Acrylic acid based on renewable raw materials, water-absorbing polymer structures, and method for the production thereof by means of dehydration

A water-absorbing polymer and a technology for the preparation process, which can be used in the preparation of carbon-based compounds, the preparation of organic compounds, the preparation of carboxylate and other directions, and can solve the problems of high cost, difficulty in obtaining crude oil, and large sanitary products.

Inactive Publication Date: 2008-04-02
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A disadvantage of this process for the preparation of acrylic acid is that the reagent used (propylene) is produced from crude oil, i.e. from unsustainable feedstocks, and is therefore uneconomical in the long-term perspective, as the availability of crude oil has become getting harder and more expensive
[0005] Known superabsorbents have the disadvantage that they are not renewable unless they at least partially comprise natural polymers such as cellulose
This is obviously disadvantageous because it makes the sanitary article bulky and bulky, which significantly reduces wearing comfort and leads to a large amount of waste, which in turn increases disposal space or combustion costs, and requires increased transport capacity for sewage discharge
All of these can adversely affect the environmental tolerance of absorbents based on natural polymers

Method used

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  • Acrylic acid based on renewable raw materials, water-absorbing polymer structures, and method for the production thereof by means of dehydration
  • Acrylic acid based on renewable raw materials, water-absorbing polymer structures, and method for the production thereof by means of dehydration
  • Acrylic acid based on renewable raw materials, water-absorbing polymer structures, and method for the production thereof by means of dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] Embodiment 1: liquid phase dehydration

Embodiment 1a

[0134] In the apparatus of Fig. 2A paragraph (in the dotted frame), an aqueous (5%) glycerol solution was injected for liquid phase dehydration, the solution previously adjusted to pH 2.3 with phosphoric acid. The solution was heated in the reactor to 283°C at 58 bar with an average residence time of 9 minutes. Nitrogen bubbles were introduced into the reactor through a metal fritte. The amount of nitrogen charged was 41 Nml based on the volume and hours of the reactor. The conversion rate of glycerin was 61%, and the selectivity rate of acrolein was 85.6%.

Embodiment 1b

[0136] In the apparatus of Fig. 2A, an aqueous (5%) glycerol solution for liquid phase dehydration, which was previously adjusted to pH 2.3 with phosphoric acid, was injected. The solution was heated in the reactor to 285°C at 61 bar with an average residence time of 9 minutes. Nitrogen bubbles were introduced into the reactor through a metal porous device. The amount of nitrogen charged was 41 Nml based on the volume and hours of the reactor. The conversion rate of glycerin was 72.1%, and the selectivity rate of acrolein was 74.8%.

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Abstract

The invention relates to a method comprising at least the following steps: a) glycerin is dehydrated so as to obtain a dehydrated product containing acrolein; b) the dehydrated product is subjected to gas phase oxidation so as to obtain a monomer gas containing acrylic acid; c) the monomer gas is contacted with a quenching agent so as to obtain a quench phase containing acrylic acid; d) the quench phase is reprocessed so as to obtain a monomer phase containing acrylic acid. A liquid phase (a1) and a gas phase (a2) are provided during the dehydration process, a plurality of gas bubbles being produced in the liquid phase (a1). The invention further relates to a method for producing polymers by polymerizing acrylic acid, preferably for producing water-absorbing polymers, the water-absorbing polymers obtained by means of said method, a compound, a method for producing a compound, the compound obtained by means of said method, and other chemical products.

Description

technical field [0001] The invention relates to a process for the preparation of acrylic acid, a process for the preparation of polymers, preferably water-absorbing polymers, by polymerizing acrylic acid, water-absorbing polymers obtained by this process, water-absorbing polymers based on at least 25% by weight of partially neutralized acrylic acid, composites, composites Production process, composites obtained by this process, use of acrylic acid in the production of water-absorbing polymer structures, equipment for the production of acrylic acid, process for the production of acrylic acid and acrylic acid obtained by this process. Background technique [0002] Acrylic acid used to make polymers needs to be of very high purity. Especially when the polymer is a so-called superabsorbent in combination with wound dressings or hygiene articles. These polymers are capable of absorbing and binding aqueous liquids to form hydrogels. Therefore, superabsorbents are particularly su...

Claims

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Application Information

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IPC IPC(8): C07C57/055C07C49/203C07C45/52C08F120/06C08L33/02D06M15/263C09D133/02
CPCB01J19/32B01J2219/185B01J2219/00081C07C45/52B01J2219/00768B01J2219/00159C07C51/252B01J2219/00094B01J2219/32279B01J2219/0004C08F2/00C08F2/20C08F220/06B01J10/002B01J2219/32286B01J8/025B01J2219/1943B01J2208/00176B01J8/22B01J19/006B01J2208/0053B01J19/2415C07C47/22C07C57/04
Inventor 京特·布勃于尔根·莫斯勒弗朗茨-费利克斯·库平格安德烈亚斯·萨巴格吉多·斯托尼奥约尔格·绍尔马库斯·温特贝格乌多·克尼彭贝格京特·拉托斯尚斯基弗兰克·富尔诺
Owner EVONIK DEGUSSA GMBH
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