CO-PROCESSING OF COTTON SOAPSTOCK, COAL DUST AND POLYMER WASTE BY PYROLYSIS METHOD

Abstract

Introduction. The work is aimed at solving the problems of rational consumption of
secondary raw materials on the basis of carbon-containing waste of industries, saturation of the market
with additional products and protection of the environment from the toxic effects of waste. Aim of work:
the study of the co-pyrolysis process of gossypol resin (GR) from cotton soapstock of "Shymkentmay"
JSC, coal dust (CD) of Kulan deposit and plastics waste (PW) in N2 medium. The methodology of work
included the establishment of optimal modes of the process, determination of yield, composition and
properties of pyrolysis products. Analysis of pyrolysis products by IR spectroscopy, XRD, chromatomass
spectrometry. Study of the component composition of liquid pyrolysis products by the method of
extraction separation in Soxhlet apparatus into oils, asphaltenes and resins. Assessment of perspectivity of
co- pyrolytic processing of carbon-containing wastes from different industries for industrial development.
Results and discussion. The optimum temperature of GR pyrolysis (T=450 ⁰С) was established, at which
the yield of liquid product was on average 33.01 wt.%, gas yield – 60.33 wt.%, yield of solid residue –
6.65 wt.%. The co-pyrolysis of GR and CD at 1:1 ratio and T=500 ⁰C in N2 atmosphere was investigated
for the first time. A high yield of liquid product – 47.34 wt.%, low gas formation – 2.31 wt.% and a large
amount of solid residue – 50.34 wt.% were observed, which is apparently due to the formation of coal
semicoke and coke. The process of co- pyrolysis of GR, CD with D=90 μm and PW (PE:HPPP – 1:1) at
the ratio of 1:1:1 and temperatures of 500 ⁰С-700 ⁰С in N2 atmosphere was investigated for the first time.
It is shown that the main contribution to the formation of liquid products in the given temperature regimes
is made by GR and PW. Conclusion. Co-processing of carbon-containing wastes was found to be of
interest and practical importance, both in terms of obtaining marketable products and maintaining a safe
ecology.