Recently, group of task of university of Chinese science and technology Professor Ceng Jie upgrades in plastic loop the domain gains revolutionary headway. Researcher design gives hydrogen of a kind of “ to breathe ” strategy, in need not additional add hydrogen to enrage or polyethylene spends high density below the circumstance of solvent plastic translate into is tall the cricoid hydrocarbon of additional cost kind, for deserted and plastic “ ” of artificial carbon loop provided new method. On June 26, research achievement is published in international famous learning periodical " technology of rice of natural · accept " on.

Why does academician of the Chinese Academy of Sciences, petro-chemical expert cry yuan of professor think, “ worked this to combine reforming of the catalysis in oil refining industry and hydrogenation cracking ably the fundamental of two processes, realize plastic degradation new line with perfect balance of hydrogen, it is the major breakthrough of plastic degradation science and technology. ”

High density polyethylene is plastic sketch map of the degradation below the action in activator

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Is polyethylene plastic be equivalent to ” of “ solid oil?

Polyethylene is plastic be 5 big general and plastic one of, by ethylene element each other are linked together polymer of a when form long chain, each chain link is comprised by ethylene element. Its framework is be linked together by carbolic atom and become, stability is very tall, hard natural degradation.

Popularly, the polyethylene that people buries processing to discard through burn or be being filled is plastic. And burn the process can produce many carbon dioxide and toxic gas, pollute atmosphere environment; Fill bury an ability of the chiliad on need by degradation, in this process, still can release soil of small plastic pollution and groundwater. Have similar chemical structure and composition considering polyethylene and oil, the bravery of National People's Congress such as Ceng Jie guesses —— whether regard polyethylene as directly ” of oil of solid of a kind of “ , draw lessons from petro-chemical technology, is petrolic of synthesis of in order to downstream Where is chemical product?

Ceng Jie introduces, “ if this guesses hold water, not only OK and significant degradation is deserted and plastic, reduce the pollution to the environment, still can efficient upgrade plastic in the carbolic resource with larger reserve. ”

Big Chinese division Professor Ceng Jie holds polyethylene plastic powder and degradation child are cricoid hydrocarbon

In studying this, cracking of hydrogenation of —— of a when researcher machines look focusing to oil above all important process, it is OK will long chain paragraph heavy qualitative oily splitting decomposition, get the oil of short cable length is tasted thereby, wait like benzine, kerosene and derv.

Researcher consults this method, have hydrogenation cracking test for raw material with polyethylene, the product of chain certificate hydrocarbon that heat up in a steamer of benzine of successful translate into distributes, confirm polyethylene is equivalent to ” of “ solid oil further.

Meaning of literal of ’ of cracking of hydrogenation of ‘ of “ no less than, this process needs to use up many and hydric, and hydric itself is very costly. In addition, the existing craft that make hydrogen still can cause carbon to discharge. ” Ceng Jie says, further, they from improve craft to begin, try to using hydric condition to fall, implementation discards the loop with plastic polyethylene upgrades.

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Develop new-style activator to realize dynamic “ hydrogen to breathe ”

Catalytic reforming is another kind of important step in oil treatment process, can divide light benzine heat up in a steamer change to become the high-octane benzine that contains a lot ofaromatic hydrocarbon, or the industrial chemicals such as benzene, toluene and xylene, arise hydric.

The generation in catalytic reforming process is hydric, use up in hydrogenation cracking process hydric. If establish ties and use these two processes degradation of Yu Juyi Xi, be equivalent to letting the plastic dehydrogenation that become link become cricoid hydrocarbon “ to breathe out at the same time ” goes out hydric, let plastic “ suck ” to become short chain into hydric splitting decomposition at the same time.

Ceng Jie introduces, this one strategy uses “ the hydrogenous atom of polyethylene oneself is replaced adscititious hydric, reduce cost not only, and energy-saving decrease a platoon, the ‘ that realizes hydrogenous element thereby is produced oneself sell ’ oneself. ”

The most important is, still can break the stable carbolic framework in polyethylene in this process, make molecular catenary paragraph shorten, and gotten result is cricoid hydrocarbon, have higher value than chain certificate hydrocarbon.

Want to realize dynamic “ hydrogen to breathe ” strategy, searching a kind of appropriate activator is crucial.

The ” of metallic “ ruthenium that researcher thinks of to have tall dehydrogenation active to alkyl hydrocarbon instantly. But experimental result makes clear, outstanding to effect of dehydrogenation of alkyl hydrocarbon catalysis ruthenium grew fall ” in the “ on polyethylene however, the “ in the tentative idea breathes out ” gives hydric carbolic framework to annulus changes a course and did not happen, generated the olefin of thimbleful only, the “ hydrogen that the specification depends on metallic ruthenium to cannot make plastic implementation dynamic only breathes ” .

Ceng Jie raises “ acidity the dot can promote alkene annulus to change cricoid hydrocarbon. ” researcher introduced on original metallic ruthenium activator have acidity the molecular sieve of the dot serves as carrier. They discover, this kind of new-style activator can make polyethylene produces dehydrogenation annulus smoothly to change a course, release hydric, initiate follow-up hydrogenation cracking process smoothly.

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Essence of life cuts out definitely make ” of “ cricoid hydrocarbon

Below the ruthenium activator action that sifts load in the element, deserted polyethylene is plastic gradually by degradation.

When the molecular sieve that chooses dimension of different a narrow passage providing the only means of access to a certain place when researcher undertakes catalysis reacts, they discover, a narrow passage providing the only means of access to a certain place crosses small conference to cause generated cricoid hydrocarbon to be gotten stuck to be among a narrow passage providing the only means of access to a certain place, stemmed a narrow passage providing the only means of access to a certain place, make reaction is interrupted. Contrarily, when should choosing the molecular sieve with wider entrance of a narrow passage providing the only means of access to a certain place to undertake catalysis reacts, to polyethylene element manacle ability weaker,

For this, researcher chose meticulously to have the molecular sieve of size of proper a narrow passage providing the only means of access to a certain place, can make polyethylene element is become by choice accurate cut out unwanted material in a narrow passage providing the only means of access to a certain place already cricoid hydrocarbon, won't make again child block a narrow passage providing the only means of access to a certain place,

Final, below the action that sifts activator of laden metal ruthenium in the element, through catalytic reaction of 24 hours, high density polyethylene is changed plasticly rate achieve 69.6% . Among them, main degradation child is hydrocarbon of fluid annulus shape.

Ceng Jie introduces, the chemical industry that “ cricoid hydrocarbon is high additional cost is tasted one of, can regard synthesis as medicaments, dye, colophony and fibrous raw material, use is extensive. ”

In addition, researcher returns discovery, the powder that uses polyethylene no matter, last film is plastic perhaps bottle, can achieve same loop to upgrade the effect.

Han Buxing evaluates researcher of institute of chemistry of academician of the Chinese Academy of Sciences, the Chinese Academy of Sciences, “ works this will deserted polyethylene is plastic contaminant of this kind of environment is used at preparation product of oil radical chemistry, for deserted and plastic ‘ ’ of artificial carbon loop provided new method, for petrolic the part is replaced put forward new thinking. ”

“ did not come, we do not contain development the activator of precious metal ruthenium, reduce activator cost, introduce nature body to measure at the same time relatively valence gets Dajulian easily in all reactant, increase the value of child further. ” Ceng Jie says.

Origin: Abandon plastic new observation