Method for continuously dissolving a solid in a reaction medium

A reaction medium and solid technology, applied in the field of insoluble solids, can solve problems such as phenothiazine difficulty

Active Publication Date: 2022-02-22
EVONIK OPERATIONS GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both variants have disadvantages: additional expense and space required for installation of large volume pre-mixing vessels
However, phenothiazine is poorly soluble in the medium of the anhydride exchange reaction, so a solution of phenothiazine in acetone prepared in a separate vessel is usually introduced into the process, leading to the above-mentioned disadvantages

Method used

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  • Method for continuously dissolving a solid in a reaction medium
  • Method for continuously dissolving a solid in a reaction medium
  • Method for continuously dissolving a solid in a reaction medium

Examples

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Embodiment

[0065] The process of dissolving phenothiazines in acetic acid according to the method of the invention was investigated experimentally. figure 2 The associated experimental setup is exemplified.

[0066] A fixed bed of phenothiazine is placed on a temperature-controlled chromatographic column ( - Labor GmbH, Superformance 300-16, 300 mm long, 16 mm inner diameter, double walled for constant temperature, 20 μm F-type filter frit). Pump P-01 conveys acetic acid from the reservoir through a fixed bed temperature controlled to 20°C into a waste container. Pump P-02 diverted the sample stream to the UV detector. The phenothiazine concentrations were determined by absorption measurements at 390 nm. The detector was previously calibrated with solutions of known concentrations of phenothiazines.

[0067] The first experiment was performed at a flow rate of 12.4 cm / min at a volume flow of 25.0 ml / min. image 3 The phenothiazine concentration profile (red) is shown relative to t...

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Abstract

The present invention discloses a method for continuously dissolving a solid in a reaction medium, the method comprising the steps of: (a) providing a liquid by withdrawing a portion of said reaction medium from a first reaction vessel; (b) making The supplied liquid is contacted with a solid in a second reaction vessel, wherein the solid is present in the second reaction vessel in the form of a fixed bed that is passed through by the liquid to form a solution of the solid and (c) recycling the solution formed in step b) to said first reaction vessel.

Description

technical field [0001] The present invention relates to a method for continuously dissolving solids, especially poorly soluble solids, in a reaction medium. Background technique [0002] A fundamental problem in chemical process engineering is the addition of poorly soluble solids to reaction media. Traditionally, poorly soluble additives are dissolved in a suitable solvent in a separate reaction vessel (premix vessel), and this solution is subsequently added to the actual reaction medium. For additives with particularly low solubility in the actual reaction medium, this approach requires large capacity pre-mixing vessels and / or the use of additional solvents in which the additives are readily soluble. However, both variants have disadvantages: additional expense and space are required to install a large-capacity premixing vessel. This is especially problematic when existing installations are to be retrofitted with such premixing vessels. In contrast, the use of additiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F21/00C07C57/04C07C51/573
CPCC07C51/573B01J2208/00787B01F21/02B01F21/30C07C57/04B01D3/143B01J8/0242B01J8/0278B01J2219/00038C07D279/20
Inventor D·布勒尔T·诺尔
Owner EVONIK OPERATIONS GMBH
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