Waxes catalytic cracking

Additional gasoline and diesel fuel can be produced through further refining, such as hydrocracking or catalytic cracking of the wax product. 

As an example, the results from catalytic cracking of three types of waxes from thermal cracking of PE are given in Table 8.2 [22], The catalyst used, the equilibrium FCC catalyst. 

Table 8.3 Some results from catalytic cracking of pyrolytic wax derived from PE pyrolysis ...

The components of products from thermal and catalytic cracking of HDPE, LDPE, LP, PP, PS were analyzed [48], and the results are shown in Table 28.2 and Table 28.3. The products from thermal cracking of HDPE, LDPE and LP (linear polyethylene) are mainly wax-like substances at normal temperamre. The fraction under 200°C recovered from HDPE accounts for 16% of the total cracking products, while that from LP accounts for 23%. Compared with tlie products of PE, PP produces less solid residue, but more liquid components, and PS produces the highest proportion of liquid fraction, which is 99.17% by thermal cracking and 99.56% by catalytic cracking. 

Cyclopentane is a petroleum product. It is formed from high-temperature catalytic cracking of cyclohexane or by reduction of cyclopentadiene. It occurs in petroleum ether fractions and in many commercial solvents. It is used as a solvent for paint, in extractions of wax and fat, and in the shoe industry. 

Vacuum Dbtillation. Vacuum distillation may be employed for the redistillation of pressure distillate, pressed distillate, or bright stock solution. It may be used for distilling topped crude oils for the production of wax distillate and cylinder stock, or it may be used to reduce a residual stock to asphalt or pitch. Vacuum systems are widely used to produce catalytic cracking plant feed stocks of low carbon content. 

Dupain, X., Krul, R.A., Makkee, M., Mouhjn, J.A., 2005. Are Fischer—Tropsch waxes good feedstocks for fluid catalytic cracking units Catalysis Today 106, 288—292. 

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