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BC Bugwood Envirochem Services Inc. Semi-mobile prehydrolysis plants can vary in size. One unit will process 90 BDT/day of bugwood using a single 30 m3 reactor, or can use up to 1,080 BDT/day using two 180 m3 reactors, as shown in Table 4.2.2. The footprint of the 1,080 BDT/day prehydrolysis plant is 150 m by 90 m, thus requiring an area of 13,500 m2. Prehydrolysis of biomass is performed in a reactor vessel made of 10-mm high-strength low-alloy carbon steel to minimize costs. The reactor is lined with a 2-mm titanium sheet for corrosion resistance. A vacuum between the titanium sheet and the steel vessel ensures reactor integrity is maintained. A feeder compresses the chipped biomass to a 300 kg/m3 bulk density to reduce the requirements of the weak acid solution by limiting the acid to wood ratio to 2. The prehydrolysis process requires 90 minutes allowing 12.5 cycles per reactor per day producing 90 BDT/day of CL for the 30 m3 reactor, as shown in Table 4.2.3. In addition, furfural, alcohols and xylitol can be produced from the resulting liquor and wash water used to clean the CL. Table 4.2.2 Prehydrolysis Plant Size Reactor size (m3) Number of reactors per site Total Reactor Volume (m3) Bugwood harvest (BDT/day) 30 1 30 90 30 2 60 180 30 4 120 360 180 6 180 540 180 6 360 1080 Bugwood volume is on a dry basis and density of bugwood is 380 kg/m3 This flexibility in capacity when using multiple reactors allows a minimum operation based on seasonal availability of personnel, bugwood, and dispersed biomass harvested during peak operation. Using the data in Table 4.2.4 for Year 2011, it is necessary to have nine prehydrolysis sites with various sizes in order to process the average daily bugwood available for harvest. Some sites may have two 180 m3 reactors and other sites may have two to four 30 m3 reactors. The economics are improved with the use of larger 180 m3 reactors. Plant capacity shown in Table 4.2.4 is significantly underestimated to account for the decline in bugwood availability over time and the delay in regrowth. A total of 2,520 BDT/day would be processed and harvested at these nine locations, and because these plants can be relocated, it is assumed that biomass feedstock accessibility would not be an issue over time. Table 4.2.3 Details of the Prehydrolysis Reactor Total cycle time Batch/day Downtime Volume per batch of bugwood Total bugwood volume processed per day Biomass processed CL efficiency CL produced 90 minutes 12.5 per day 10 % 30 m3 375 m3 113 BDT/day 80 % 90 BDT/day Prehydrolysis Plant Page 27PDF Image | IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS
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