DE2716478A1 - PROCESS FOR THE PRODUCTION OF ABRASION-RESISTANT, NON-DUSTING, WATER-SOLUBLE COLORANT PARTICLES - Google Patents

Description

_ ₃ _ 27164 8

The invention relates to a method for producing water-soluble, non-dusting dye particles in the fluidized bed.

It is known water-soluble dyes, especially reactive dyes, produced in spray towers from their concentrated solutions. The resulting dye powder is always very high fine with a correspondingly low bulk weight and very dusty. Even though it is a fine grain, because of the high rate of dissolution associated with it and the pace of work made possible thereby is desired, dust-free or low-dust dyes and Dye preparations required to avoid nuisances and impairments by operating personnel and to avoid contamination of the production rooms and production products.

It is known to carry out subsequent dedusting by dusting agents such as oils are used in the dye powder or other various additives, or combinations thereof. This subsequent dedusting by mixing in a Dedusting agent is on the one hand very cost-intensive, on the other hand it can add a number of additional, unpleasant new ones Problems for the dye user, depending on which substances are used as dedusting agents. The problem of the low bulk weight is not taken into account.

The object is therefore to create a method for producing abrasion-resistant, non-dusting dye particles.

The object is achieved in that one in a fluidized bed of dye particles, which is through a gas stream, the moisture can absorb, is generated, sprayed aqueous dye solutions.

The dye solution can be applied from above, from below and / or from the side the fluidized bed can be sprayed. It can be provided with an adjusting agent. Under solid solution is an aqueous solution that may contain solids from 0% to their saturation. Evaporated salt, among other things, can be used as thickening agent. It is

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ORIGINAL INSPECTED

possible to classify the dye particles and undersized as well as crushed Return oversized grain to the fluidized bed.

Steam can also be sprayed onto the fluidized bed. Although not required, binders such as Manutex or Tylose can be added. If the dye solution or the set dye solution is now pre-concentrated in a suitable apparatus, this can reduce the dwell time in the fluidized bed and the associated possible temperature loads while saving energy at the same time be reduced. The number of nozzles depends on the size of the fluidized bed and the throughput. The order the nozzles - from above, below and / or the side - has no fundamental influence on the granulating process. Advantageously an arrangement is chosen, with the help of which one can spray onto the fluidized bed from above.

The process is both discontinuous and continuous operable. In the continuous mode of operation, it is advantageous; the product input stream of the dye powder or the granulate, or to guide the mixture of powder and granulate through the spray cone of the dye solution. The agglomerates are discharged in a known manner via suitable organs such as rotary feeders. The dye dust entrained by the incoming air becomes held by self-cleaning dry filters and the fluidized bed supplied again directly or via the metered addition.

The invention is explained in more detail on the basis of the experiments below (table). The experimental apparatus is shown by way of example in the figure Execution shown.

The fluidized bed apparatus consists of the housing 1 for the fluidized bed chamber. In addition to the metering device 5, the vortex apparatus at least one spray nozzle 2. The hot fluidized air is supplied through the gas inlet 4 via perforated plate 6 and leaves The fluidized bed apparatus is loaded with moisture at 7. Immediately above the perforated plate 6, the extraction nozzle 8 for the end product ends. The connector 8 is provided with a rotary valve 3.

809843/0073

attempt m ² 1 2 3 4th dye Nm ³ Zh Remazol ^(R) brilliant
blue
61200 Reactive Blue 19 (R)
Remazol Black B
20505 Reactive Black 5 (R)
Remazol Black B
20505 Reactive Black 5 Remazol ^(R) gold gel
18852 Reactive Yel
low 17 Vortex surface ⁰ C 0.4 0.4 0.4 0.4 Vortex air volume ⁰ C 330 1200 350 360 Vortex air temp. kg / h 80 135 90 150 Production temp kg / h 35 65 35 40 809 Throughput color
material kg / h - - 40 36 CX)
-Ρ »
co Throughput
water kg 10 - 6th - Ή »
O Throughput
Dye dissolving. g / i - 50 - 11
.1 073 Original amount g / i 83 30th 10 10 Rüttgew. The end-
ganspr. g / i - - - 421 Bulk weight
Output pr. g / i 750 700 700 - Rüttgew.
End product around - - - 403 Bulk weight
End product 659 990 315 - Grain size
End product 97%> 200 100%> 250 80%> 150 52%> 200 * BC

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Claims (5)

Patent claims: 1. A method for producing abrasion-resistant, non-dusting, water-soluble dye, characterized in that it is produced in a fluidized bed of dye, which can absorb by a gas flow, moisture, sprayed aqueous dye solution. 2. The method according to claim 1, characterized in that the dye solution is sprayed from above onto the fluidized bed. 3. The method according to claim 1, characterized in that the dye solution is sprayed onto the fluidized bed provided with adjusting agent. 4. The method according to claim 1, characterized in that a dye solution containing from 0% to its saturation solids and provided with evaporated salt as a setting agent is sprayed onto the fluidized bed. 809843 / Q073 ^{/ 2} ORIGINAL INSPECTED " ^A " 27 16ν. * HOE 77 / F 076 5. The method according to claim 1, characterized in that in the solid particles are classified in a secondary circuit and comminuted oversize and / or undersize is returned to the fluidized bed. 8098 Λ 3/0073 ^{/ 3} ORK3INAL INSPECTED