Twin screw extruder press for solid/fluid separation
a technology of extruder press and screw extruder, which is applied in the direction of press ram, separation process, filtration separation, etc., can solve the problems of difficult to effectively separate solids from liquids under the high heat and pressure required for cellulose pre-treatment, and unsatisfactory low solids conten
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example i
Biofuel Process
[0100]As shown in FIG. 1, a simple continuous cellulosic ethanol pre-treatment system 2 of the present invention consists of only three machines. A first extruder 4 being used as a continuous high pressure plug feeder / mixer for biomass. The extruder 4 feeds the biomass into a vertical reactor 6. The vertical reactor 6 is capable of having a long residence time. The vertical reactor 6 feeds the biomass into a second extruder 8, preferably a twin screw extruder. The pre-treatment process comprises flowing the biomass through the first extruder 4, the vertical reactor 6, and the second extruder 8.
[0101]The extruder 4, which may also be a twin screw extruder, is used to provide a continuous feed into the pressurized vertical reactor 6. Mixing of various chemicals in the extruder 4 is possible depending on the type of feedstock. The extruder 4 has an automatic valve, which closes upon loss of feed to prevent loss of pressure in the case of loss of feedstock.
[0102]Vertical ...
example ii
Feedstock Soybeans
[0113]Soybeans were sourced locally (grown in Chatham-Kent, Southern Ontario, Canada). Content analysis of the soybeans showed the feedstock was composed of 70.7% / wt solids and 29.3% / wt liquids, in the form of 13.8% / wt oil and 15.5% / wt water. The soybeans were fed whole into the extruder without pre-processing. The total amount of soybeans fed into the extruder was 1.384 kg whole soybean and the total operating time of the extruder was one hour. During extrusion of the soybeans, the motor load was 8 times higher than the baseline established with water. The feed rate, solids output rate and filtrate output rate over time are graphically illustrated in FIG. 16 As is apparent from the graph, the filtrate output is constant over the whole hour of operation, thereby indicating zero degree of clogging of the filter block. The overall output of the extruder was 11.5% / wt filtrate, with 5:95% / wt equal recovery through each of filter block #1 and #2, thereby indicating that...
example iii
Feedstock Sugar Beets
[0114]Sugar Beets were sourced locally (grown in Chatham-Kent, Southern Ontario, Canada). Whole sugar beets were received directly off the field after harvest and stored at an outdoor holding depot. Prior to processing, sugar beets required washing to remove debris (dirt, stones, etc.). A hand hatchet was used to split the sugar beets, then these sugar beet slices fed into a food processor using a first pass with the grating blades, followed by a second pass with the cutting blades. This produced a particle size of ˜5 mm×5 mm biomass, which was suitable to be fed into the extruder. Content analysis of the sugar beets showed the feedstock was composed of 16.9% / wt sucrose, 1.4% / wt other soluble solids, 1.3% / wt insoluble solids, and 80.4% / wt water. The total amount of sugar beets fed into the extruder was 3.219 kg chopped sugar beets and the total operating time of the extruder was one hour. During extrusion of the sugar beets, the motor load was 25% higher than th...
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Abstract
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