The electronegative acidproof caramel color was obtained with the color intensity of 163626.

0,irradiation 14 min under medium fire,color intensity of the caramel pigment reached 93132 EBC units,and the products had positive charge.

This paper introduces the classification and the important properties of caramel pigment and explains the relation of color intensity and red index, and pH and the electronic point of the products.

Research of relation between color ratio and red index of caramel color and pH;

The photocatalytic properties of these samples were detected by decoloration rate of methyl orange solution and COD.

Experiments show that under many conditions,decoloration rate of system liquid-phase doesn't represent system's decoloration rate.

Under these optimum conditions,the oil decoloration rate of the regenerated bleaching clay could reach 97.

0,decolorization rate approaches stable.

With the increase of biomass of the organisms,decolorization rate of acid red B is also enhanced,showing a good linear relationship with RGEMs=0.

Using KL-1 photocatalytic reactor with 20 w UV light as light source,particle size in average a parth for nano TiO_2 suspension system of 30 nm,Methyl Violet 5BN can be efficiently decoloured,and there is the maximum decolorization rate of Methyl Violet 5BN in strong acid solution.

Nicotinic acid was used as a catalyst in neutral-bath dyeing of silk with monochlorotriazine reactive dye and the effect of nicotinic acid a-mount,dyeing temperature,dyeing time and concentration of electrolyte on exhaustion and fixation was discussed,respectively.

The applications of the substitutive alkali SL to dip dyeing with reactive dyes were studied,and the differences between SL and soda in fixation and effects were compared.

Reactive dyeing process of silk fabric with nicotinic acid as a catalyst is carried out , dye uptake and fixation in neutral and weak alkali conditions are compared with those of conventional dyeing process.