Method for producing wax for warm mix of asphalt from products synthesized by F-T

Abstract

The invention discloses a method for producing wax for warm mix of asphalt from products synthesized by F-T. The method comprises the following steps: products synthesized by F-T whose weight percentage of n-alkanes is 85% or above are used as raw materials, and hydro-conversion is carried out under the effects of a catalyst; sweating is carried out for hydrogenated products in order to produce the target product. The method is based on common sweating process, in a sweating process, air-flow passes through a wax layer for carrying liquid state components, separating effect of solid components and liquid components is enhanced and separating speed is accelerated; at the same time, gas generated by decomposition of inorganic salt forms micro spaces in the wax layer for facilitating rapid discharge of liquid components. The method has the advantages of low production equipment investment, simple production process, low operation cost, safety, energy saving without solvent pollution, and the like; products can reduce mixing temperature of the asphalt mixture, and at the same time rutting resistance of bituminous paving is improved.

Description

technical field [0001] The invention belongs to the technical field of special wax production, and in particular relates to a method for producing asphalt warm mixing wax with F-T synthetic products. Background technique [0002] The asphalt mixture used in road engineering is generally divided into three types according to the mixing construction temperature: hot mix asphalt mixture HMA (Hot Mix Asphalt), cold mix asphalt mixture CMA (Cold Mix Asphalt) and warm mix asphalt mixture WMA (Warm Mix Asphalt). [0003] Hot mix asphalt mixture is widely used and has good road performance. However, in the production process of hot mix asphalt mixture, asphalt and stone materials need to be mixed at a high temperature of 150-180°C, which not only consumes a lot of energy, but also During the production of hot mix asphalt mixture, a large amount of smoke and CO will be generated. 2 , CO, SO 2 , NO x Such harmful gases not only pollute the environment, but also affect the health o...

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Problems solved by technology

[0019] Compared with the solvent separation process, the sweating separation process is an intermittent operation, and the product yield is lower and the production cycle is longer, but the sweating process has the advantages of less investment, simple production process, low operating cost, safe production process, energy saving and no environmental impact. Pollution and other advantages, some manufacturers are still using this method to produce soap wax products

[0020] Over the years, the sweating separation method has been developed in terms of production equipment and technology, such as CN89214332 (vertical square multi-section sweating tank), CN94223980.6 (dish-type sweating device), CN98233254.8 (paraffin sweating tank), CN200920033500 .X (new paraffin sweating tank), CN201210508905.0 (a high-efficiency paraffin sweating device), CN201320127680.4 (tubular paraffin deoiling device), etc., have made improvements in sweating production equipment; CN91206202 (a high-efficiency paraffin sweating device) tank) has made improvements in the sweat separation process, but these improvements still cannot produce wax products with a melting point above 70 °C

[0021] The existing asphalt warm mix agent usually reduces the 60°C viscosity of asphalt while reducing the mixing temperature of asphalt mixture, thus affecting the high temperature stability of asphalt mixture

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