Method for recovering catalyst
A recovery method and catalyst technology, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve the problems of platinum group element particles that cannot be recovered and catalyst treatment efficiency is poor
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preparation example Construction
[0037] Emulsion polymerization, which is a preferred production method of a conjugated diene polymer, is usually a method of polymerizing in an aqueous medium using a radical polymerization initiator. In emulsion polymerization, as long as a polymerization initiator and a molecular weight regulator are used compounds. The polymerization reaction may be any of batch, semi-batch, and continuous, and the polymerization temperature and pressure are not particularly limited. The emulsifier used is also not particularly limited, and anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants and the like can be used, and anionic surfactants are preferable. These emulsifiers may be used individually, respectively, and may use 2 or more types together. The usage amount thereof is not particularly limited.
[0038] The solid content concentration of the conjugated diene polymer latex obtained by emulsion polymerization is not particularly limited, but is u...
Embodiment
[0120] Hereinafter, an Example and a comparative example are given, and this invention is demonstrated concretely. Hereinafter, unless otherwise specified, "parts" are based on weight.
[0121] (Evaluation of Particle Size of Platinum Group Element Particles)
[0122] The solution of the hydrogenated acrylonitrile-butadiene copolymer obtained by the hydrogenation reaction was filtered to obtain a filtrate, and the filtrate was measured by the dynamic light scattering method using a precision particle size distribution measuring device "DLS8000" (manufactured by Otsuka Electronics Co., Ltd.) , thereby measuring the particle size of the platinum group element particles in the filtrate. Here, the filtrate in which the peak of the particle diameter was observed in the range of more than 1 nm and 90 nm or less was judged to contain platinum group element particles having a nano-order size.
manufacture example 1
[0124] Into the reactor, 2 parts of potassium oleate, 180 parts of ion-exchanged water, 37 parts of acrylonitrile and 0.5 parts of tertiary dodecyl mercaptan were sequentially added. Next, after replacing the inside of the reactor with nitrogen, 63 parts of butadiene was added, the reactor was cooled to 10°C, and 0.01 part of cumene hydroperoxide and 0.01 part of ferrous sulfate were added. Next, the contents were stirred for 16 hours while keeping the reactor at 10°C. Then, after adding a 10% by weight hydroquinone aqueous solution to the reactor to terminate the polymerization reaction, unreacted monomers were removed from the polymerization reaction solution to obtain a latex of an acrylonitrile-butadiene copolymer. The polymerization conversion rate was 90%.
[0125] Next, in another reactor different from the above, 300 parts of coagulation water in which 3 parts of calcium chloride (coagulant) was dissolved was added, and the latex obtained above was added dropwise whil...
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