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Drying method of heat sensitive reducer

A drying method and technology of reducing agent, which can be used in drying solid materials, method combination to dry solid materials, and preliminary treatment to promote the drying of solid materials, etc. Degree, uniform heating effect

Inactive Publication Date: 2009-11-04
FUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiency of the drying process of the reducing agent in the existing printing and dyeing industry, and proposes a drying method which is low in drying cost but can effectively solve the thermal decomposition and oxidation of the heat-sensitive reducing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The drying method step of embodiment 1 thermosensitive reducing agent is as follows:

[0037] The heat-sensitive reducing agent modified white sugar reducing agent has an initial moisture content of 35%, a light yellow liquid, and a reduction potential of 970. Add 20kg of sorbitol to 980kg of reducing agent, stir well; let it stand for 30 minutes, blow in cold air for convection, make the reducing agent material condense and remove surface water; cut the condensed reducing agent into pieces and mash, flat Lay it on the conveyor belt, control the thickness at 40mm, control the vacuum degree in the microwave drying chamber at 0.06 MPa, microwave power at 2kW, temperature at 60°C, and dry for 8 minutes. At this time, the moisture content of the reducing agent material is 10%; turn off the microwave drum Hot air convection, let the reducing agent material cool for 5 minutes, turn on the microwave again, control the temperature at 90°C, dry for 2 minutes, and then crush and ...

Embodiment 2

[0038] The drying method step of embodiment 2 thermosensitive reducing agent is as follows:

[0039] The heat-sensitive reducing agent thiourea dioxide derivatives containing sulfonic acid groups has an initial water content of 38%, light yellow liquid, and a reduction potential of 970. Add 30kg of 2-butene-1,4-butanediol dibutyrate to 970kg of reducing agent, and stir thoroughly; it is left to stand for 30 minutes, blowing in cold air for convection, so that the reducing agent material is condensed and the surface water is removed; The condensed reducing agent is cut into pieces and crushed, spread on the conveyor belt, and the thickness is controlled at 50mm; the vacuum degree in the microwave drying chamber is controlled at 0.05 MPa, the microwave power is 2kW, the temperature is 50°C, and dried for 6 minutes. The moisture content of the reducing agent material is 14%. Turn off the microwave and let the reducing agent material slow down for 5 minutes. Turn on the microwave ...

Embodiment 3

[0040] The drying method step of embodiment 3 thermosensitive reducing agent is as follows:

[0041]Heat-sensitive reducing agent Sulfonated aldehyde ammonia reducing agent has an initial water content of 40%, a white emulsion, and a reduction potential of 985. Add 25kg of glycidyl isocyanurate to 975kg of reducing agent, stir well; let it stand for 30 minutes, blow in cold air for convection, make the reducing agent material condense and remove surface water; cut the condensed reducing agent into pieces and pound Crushed, lay flat on the conveyor belt, the thickness is controlled at 45mm; the vacuum degree in the microwave drying chamber is controlled at 0.1 MPa, the microwave power is 3kW, the temperature is 60°C, and dried for 10 minutes. At this time, the moisture content of the reducing agent material is 15%; Turn off the microwave and let the reducing agent material slow down for 5 minutes, turn on the microwave again, control the temperature at 85°C, and dry for 3 minut...

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Abstract

The invention discloses a drying method of a heat sensitive reducer, in particular to a drying method of a heat sensitive reducer used in printing and dyeing industry. The drying method comprises the following steps: adding a heat stabilizer to the prepared heat sensitive reducer and fully stirring the mixture; pumping cold air to condense the reducer in emulsion state and getting rid of the surface water; controlling the vacuum degree in a microwave drying cavity to be below 0.1MPa and temperature between 50 DEG C and 60 DEG C and carrying out microwave heating for 6-10min; closing microwave and pumping hot air to carry out tempering on the reducer material for 5-10min; opening the microwave again, controlling the temperature between 80 DEG C and 100 DEG C and drying for 2-3min; grinding and packaging the reducer material. The water ratio of the dried reducer material is 3-5% and the reducer material is milky white. The method can effectively protect the product performance of the heat sensitive reducer material, shorten drying time, reduce energy consumption and save drying cost.

Description

technical field [0001] The invention belongs to the field of drying heat-sensitive materials, and particularly relates to novel heat-sensitive reducing agents used in the printing and dyeing industry, such as modified sugar reducing agents, thiourea dioxide derivatives containing sulfonic acid groups, sulfonated aldehyde ammonia reducing agents, ureidopentane Sulfonate, ureidoethanesulfinate drying method. technical background [0002] Heat-sensitive reducing agent is mainly used as an auxiliary agent for sulfur dyes and vat dyes in the printing and dyeing industry. It is a substitute for sodium sulfide and sodium hydrosulfite. It begins to decompose when it exceeds 80°C under normal pressure, and it is easily oxidized after heating. The product has a moisture content of 20% to 40% before drying. It is a heat-sensitive material. The decomposition temperature under normal pressure is 80°C. The product has a high viscosity. If it is dried by conventional heat, the surface will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B7/00F26B1/00D06P1/44
Inventor 刘明华许平凡
Owner FUZHOU UNIV
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