| 摘要 |
A method of increasing the rubber recovery from guayule shrubs comprising: A. utilizing briquettes comprsing () compressed chopped guayule plant latter having an average size of 15' or less, comprising bagasse, rubber, resin, residual water and (ii) no more than 5 weight % leaves from guayule shrubs, wherein the briquettes have a density that is 40325% higher than the density of the non-compressed guayule plant matter; B subjecting the briquettes to an organic soient extraction process whereby the briqu ettes are mixed vith at least one polar organic solvent and at least one non-polar organic solvent to fonn a slurry that contins plant matter, organic solvents and 05-10 weight % water; and C, processing the surry to remove bagasse and resin and recover 95-99% by weight of the rubber contained within the briquettes, wherein (B) and (C) comprise: a, preparing a slurry from (i) the briquettes wherein the briquettes contain guayule plant matter comprising bagasse, rubber and resin (ii) the at least one non-polar organic sotvent and (iii) the at least one polar organic solvent, wherein the slurry contains 10-50% by weight plant matter from the briquettes 50-90% by weight of (ii) and iii) combined, and 05-0 weight% water from the plant matter; b, removing a majority of the bagasse from the slurry to produce a miscella and a first bagasse portion; e optional adding additional polar organic solvent non-olar orgac cont or a combination thereof to the miseia to form a reduced viscosity miscella where any polar organic solvent and non polar organic solvent may be the same or different than those utilized in (a) and where the amount of any additional polar organic solvent that is added is less than the amount that causes the rubber contained with the reduced viscosity misceila to coagulate; d. utilizing a centrifuge to remove 80-95 weight % of bagasse from the miscella resuming fromn (b)or (c) (based on the total weight of bagasse present in the miscelia) to form a purified miscelia and a second bagasse fraction wherein the majority ofrthe bagasse that is removed has a particle size of less than 105 microns; e. optionally treating the purified miscela to remove additional bagasse thereby producing a ciarfied rubber solution that contains 0.01-1% by weight of bagasse (based on the total weight of bagasse present in the slurry) wherein 90-99% of the additional bagasse that is removed has a particle size greater than 4 microns; f increasing the relative amount of polar organic solvent as compared to non-polar organic solvent Within the clarified rubber solution so as to coagulate the rubber; and g. producing solid purified rubber from the coagulated rubber where when said solid purified rubber contains 0.8 weight % volatile matter it also contains O.05-0.5 weight % dirt, 0.2-1:5 weight % ash and 0'1-4 weight % resin: wherein at least (ab(e) are conducted at a temperature or temperatures of C 0-80"Q and a pressure of 35 to 1000 kPa. |
