PROBLEM TO BE SOLVED: To provide a styrene-based resin composition excellent in impact resistance and moldability and processability, free from defective appearance by gel and having slight anisotropy of strength, elongation, etc. and a sheet and a molded article each using the composition. SOLUTION: The styrene-based resin composition comprises (A) a styrene-based resin mixture and (B) a styrene-diene-based block copolymer. In the styrene-based resin mixture (A), (1) weight average molecular weight obtained by GPC-MALLS method is 25-750,000 and (2) the gradient in area of 25-10,000,000 molecular weight is 0.35-0.45 in a double logarithmic chart in which molecular weights obtained by GPC-MALLS method are plotted in abscissa and inertial radii are plotted in ordinate. The sheet and the molded article are each obtained by using the resin composition. COPYRIGHT: (C)2007,JPO&INPIT

Styrene-based resin composition and styrene-based resin sheet and molded product using the same composition

PURPOSE:To carry out the denitration reaction at optimum gas temperature, by placing two-stage exhaust gas heater after an ammonia oxidizer, and attaching an ammonia catalytic reduction denitration apparatus to the outlet channel of the former stage heater. CONSTITUTION:NH3 evaporated by the evaporator 1 is mixed with air supplied through the compressor 3 and the air heater 5, and oxidized in the oxidizer 3. The produced nitrogen oxide is passed through the heater 5, the first exhaust gas heater 7A and the second exhaust gas heater 7B to effect the heat-exchange, condensed in a condenser cooler 9, introduced into the absorption column 11, and absorbed in water to obtain nitric acid. The exhaust gas exhausted from the absorption column 11 is introduced into the heater 7A through the line 15 to effect the heat-exchange and to control the gas temperature to 310-350 deg.C and gas pressure to 6-7kg/cm G at the outlet-side line D. The conditioned gas is supplied to the ammonia catalytic reduction denitration apparatus, denitrated by ammonia reduction, and supplied through the heater 7B to the steam turbine 13 to recover the energy.

Kojima Mototaka

Papers

Nitric acid plant having exhaust gas denitrizer