Bleaches spray drying

The results correspond well to previously performed alkali extraction of aspen. The final lignin content of the bleached and spray dried product was 4.8% (Klason + acid soluble lignin), analysed according to a method described elsewhere . 

As reported in literature, many bleach actives are chemically unstable in an alkaline detergent formulation if they are incorporated as a fine powder (see example for TAED in Ref. 102 or nitrile quats in Ref. 103). A further granulation step is therefore usually necessary to transform the fine powder obtained from spray drying into a stable granule. 

In relation to detergent ingredients, different microencapsulation technologies are often used for fragrances and flavors. Coacervation and spray drying are mentioned in various patent applications (see example of coacervation in Ref 139 and spray drying in Ref 140). In the case of bleach active substances, microencapsulation of TAED using a polycondensation process is described in Ref 141, and a coacervation process for the encapsulation of PAP is mentioned in Ref 142. In both cases, the use in liquid applications is intended. 

Certain ingredients such as perfumes, enzymes, and bleach cannot be processed in this way, and therefore, they are added to the spray dried product (blown powder) afterward. 

Spray dried detergent granules Surfactant agglomerates Bleaches and bleach activators Enzymes Buffers and fillers Speciality particles... 

A biodetergent is usually just a normal detergent which contains enzymes. However, enzymes are not thermostable and cannot be e msed to the high temperatures and humidities encountered in the powder detergent production process. Therefore, they are postadded to the spray-dried powder with other heat-sensitive ingredients, such as perfumes, bleaching... 

Calcium Hypochlorite Bleach - 6SS6 18-30 - E - - Spray drying (180 grams/Nter CaOCi ). AHoy C 0.07 mpy... 

Uses Corrosion/scale inhibitor, sequestrant, dispersant for industrial water treatment (cooling water, oil fields, textiles), metal ion control, detergents, textile bleaching, oil recovery, ore flotation Regulatory FDA nonregulated SARA 311/312/313 nonreportable Properties Wh. spray-dried free-flowing powd. char, odor partly sol. in water ... 

One such decontaminant is supertropical bleach (STB). STB is a mixture of chlorinated lime and calcium oxide containing about 30% available chlorine. It can be used either as a dry mix or as a slurry to decontaminate some equipment surfaces and terrain. The dry mix is prepared with two parts bleach to three parts earth by volume. A slurry typically consists of 40 parts STB to 60 parts by weight of water. This material is then sprayed or swabbed on the contaminated surface (see Bleaching agents). STB is an effective decontaminant for mustard, lewisite, and VX. It is less effective against nerve agents other than VX. 

The oil is loaded into the reactor, shown with both an agitator and a pumped circulation-spray loop, and heated under vacuum (110-130°C) to reduce water and peroxide contents. Next, the oil is cooled to 70-90°C and the catalyst is added as dry powder at 0.05-0.15 percent or suspended in dry oil. Randomization requires about 30 min, with an additional 15-30 min allowed for completioa After the reaction is complete, the batch is transferred to a postbleacher where the process is arrested by inactivating the catalyst by addition of water or an (phosphoric or citric) acid solution. Bleaching earth, added to absorb the inactivated catalyst and soaps removed by filtration and the oil sent to blending or deodor-ization. Losses from the formation of FFA and FAME are —10 times the catalyst weight, with... 

The first step in the restoration process is dry cleaning with soft erasers. Old mounts or supports, usually highly acidic, are removed. Immersion in water is prescribed for removal of discoloration in the more stable forms of art on paper etchings, prints, engravings, and some drawings. For specific stains that cannot be removed with water or other solvents, bleaching agents are applied locally. Deacidification by total immersion is preferred a spray is used when this is not possible. 

Vacuum Drying— Water-washed oil must be vacuum-dried if it is to be stored for any period of time. This is usually accomplished with a continuous spray drier, operating at 50 mm Hg absolute pressure. The vacuum-drying step is not required when the washed soybean oil is coupled directly to bleaching or silica purification (Farr, 2000). 

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