Silikonherstellung (PDMS) durch Direktprozess

Das vielseitige Polymer an der Schnittstelle von organischer und anorganischer Chemie

Materials Science & Polymers Global Industrial Scale $20 billion

Übersicht

Silicones (polysiloxanes) are produced through the Rochow-Muller direct process, reacting silicon metal with methyl chloride to form methylchlorosilanes, which are hydrolyzed and polymerized into polydimethylsiloxane (PDMS). Silicones uniquely combine properties of organic polymers and inorganic materials -- heat resistance to 300 degrees C, flexibility at -50 degrees C, water repellency, and biocompatibility. Applications span sealants, lubricants, medical implants, electronics potting, and cosmetics.

Chemischer Prozess

Silicon metal reacts with methyl chloride (CH3Cl) at 250-350 degrees C over copper catalyst in a fluidized bed reactor to produce dimethyldichlorosilane (Me2SiCl2) as the primary product (~85% selectivity). The chlorosilanes are fractionally distilled, hydrolyzed to silanols, and condensation-polymerized into cyclic and linear polysiloxanes. Ring-opening polymerization yields PDMS of controlled molecular weight.

Si + 2CH3Cl ->[Cu, 300 degrees C] (CH3)2SiCl2 (Rochow-Muller direct process)
(CH3)2SiCl2 + 2H2O -> (CH3)2Si(OH)2 + 2HCl
n(CH3)2Si(OH)2 -> -[(CH3)2SiO]n- + nH2O

Rohstoffe

  • Silicon metal (Si) — Carbothermic reduction of quartz in electric arc furnace (Silicon source)
  • Methyl chloride (CH3Cl) — Reaction of methanol with HCl (Methylating agent)
  • Copper catalyst — Copper powder or CuCl (Direct process catalyst)

Endprodukte

  • Polydimethylsiloxane (PDMS) — Sealants, lubricants, medical devices, electronics, cosmetics (Viscosity range: 1 to >1,000,000 cSt)
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Environmental Impact

Silicon metal production in electric arc furnaces consumes approximately 11 MWh per ton of silicon. Methyl chloride and chlorosilane handling requires strict emission controls. HCl byproduct from hydrolysis is recovered and recycled. Silicones persist in the environment but exhibit low aquatic and soil toxicity.

Sicherheitshinweise

Neuere Innovationen

Bio-derived silicones from rice hull ash as a silicon source reduce dependence on energy-intensive metallurgical silicon.
Reversible cross-linking enables recyclable silicone elastomers. 3D-printable silicone formulations are expanding possibilities in medical and consumer products.

Produktionsmaßstab

2500000

Tonnen/Jahr

$20 billion

Marktwert

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Frequently Asked Questions

What industry uses Silikonherstellung (PDMS) durch Direktprozess?
Silikonherstellung (PDMS) durch Direktprozess is used in the materials science & polymers sector at global industrial scale scale.
What process is involved in Silikonherstellung (PDMS) durch Direktprozess?
Silicon metal reacts with methyl chloride (CH3Cl) at 250-350 degrees C over copper catalyst in a fluidized bed reactor to produce dimethyldichlorosilane (Me2SiCl2) as the primary product (~85% selectivity). The chlorosilanes are fractionally distilled, hydrolyzed to silanols, and condensation-polyme
What is the economic significance of Silikonherstellung (PDMS) durch Direktprozess?
Silikonherstellung (PDMS) durch Direktprozess has a market value of $20 billion and annual production of 2,500,000 tons.
What is the environmental impact of Silikonherstellung (PDMS) durch Direktprozess?
Silicon metal production in electric arc furnaces consumes approximately 11 MWh per ton of silicon. Methyl chloride and chlorosilane handling requires strict emission controls. HCl byproduct from hydrolysis is recovered and recycled. Silicones persist in the environment but exhibit low aquatic and s
What raw materials are used in Silikonherstellung (PDMS) durch Direktprozess?
The main raw materials include: Silicon metal (Si), Methyl chloride (CH3Cl), Copper catalyst.