Leonid Andrussow: The Architect of Industrial Cyanide Chemistry
Leonid Andrussow was a titan of 20th-century industrial chemistry whose work fundamentally transformed the production of synthetic materials. A bridge between the theoretical rigor of the Berlin School of physical chemistry and the practical demands of the burgeoning German chemical industry, Andrussow is best known for inventing the process that bears his name—a method that remains the global standard for producing hydrogen cyanide (HCN).
1. Biography: From the Baltic to the Heart of Industrial Germany
Leonid Andrussow was born on November 28, 1896, in Riga, then part of the Russian Empire (now Latvia). He was born into an intellectually distinguished family; his father, Nicolai Ivanovich Andrusov, was a renowned geologist and member of the Russian Academy of Sciences.
Andrussow’s education was disrupted by the geopolitical upheavals of World War I and the Russian Revolution. He began his studies at the Riga Polytechnic Institute but eventually sought refuge in Germany. He enrolled at the University of Berlin, where he studied under the legendary Nobel laureate Walther Nernst. In 1925, he completed his doctorate, a credential that placed him at the epicenter of the "Golden Age" of German chemistry.
In 1927, Andrussow joined IG Farben (specifically the Oppau plant of BASF) in Ludwigshafen. It was here that he spent the most productive years of his career, navigating the transition from laboratory theory to massive industrial scale-up. Following World War II, Andrussow moved to France, settling in Paris, where he continued his research as a consultant and independent scholar until his death on December 15, 1988, at the age of 92.
2. Major Contributions: The Andrussow Process
Andrussow’s primary contribution to science is the Andrussow Process, developed between 1927 and 1930.
The Discovery:
Before Andrussow, the production of hydrogen cyanide (HCN) was inefficient and expensive. Andrussow discovered that ammonia ($NH_3$) and methane ($CH_4$) could react with oxygen ($O_2$) in the presence of a platinum catalyst to produce HCN and water. The chemical equation is:
$$CH_4 + NH_3 + 1.5 O_2 \rightarrow HCN + 3 H_2O$$
This was a breakthrough in "ammoxidation." The reaction is highly exothermic (releases heat) and occurs at extremely high temperatures (approx. 1,200°C) with a very short contact time on the catalyst.
Theoretical Work in Transport Phenomena:
Beyond his eponymous process, Andrussow was a master of the physical properties of gases. He developed empirical formulas for calculating the viscosity and thermal conductivity of gas mixtures over wide temperature ranges. In the field of chemical engineering, his work on "dimensionless numbers"—specifically the relationship between diffusion and viscosity—contributed to what is sometimes discussed in specialized circles as the "Andrussow Number."
3. Notable Publications
Andrussow was a prolific writer, contributing over 100 papers to scientific literature. His work often focused on the intersection of thermodynamics and industrial kinetics.
- "Über die katalytische Oxydation von Ammoniak-Methan-Gemischen zu Blausäure" (1935): Published in Angewandte Chemie, this is his most influential paper. It detailed the parameters of the HCN synthesis and laid the groundwork for its industrial adoption.
- Contributions to the Landolt-Börnstein Tables: Andrussow served as a key contributor to this massive, authoritative multi-volume reference work of physical and chemical data, specifically regarding the transport properties of gases and liquids.
- "Principles of the Andrussow Process" (various monographs): Throughout the 1950s and 60s, he published extensively on the optimization of catalytic surfaces and the kinetics of fast gas reactions.
4. Awards and Recognition
While Andrussow did not receive the Nobel Prize, his recognition came from the highest echelons of industrial and engineering societies:
- The Dechema Medal: Awarded by the Deutsche Gesellschaft für Chemisches Apparatewesen (German Society for Chemical Apparatus), recognizing his outstanding contributions to chemical technology.
- Honorary Memberships: He was a long-standing member of the Société de Chimie Industrielle in Paris and the Gesellschaft Deutscher Chemiker.
- The "Andrussow Process" naming: In the world of chemical engineering, having a fundamental process named after a scientist is considered the ultimate "living" monument to their work.
5. Impact and Legacy: Building the Age of Plastics
The impact of the Andrussow Process cannot be overstated. Hydrogen cyanide is a critical "platform chemical." By making HCN cheap and abundant, Andrussow enabled the mass production of:
- Methyl Methacrylate (MMA): The precursor to Plexiglas (acrylic glass).
- Adiponitrile: A vital intermediate in the production of Nylon 6,6.
- Acrylonitrile: Used to create acrylic fibers and high-performance plastics like ABS (used in everything from LEGO bricks to car parts).
- Chelating Agents: Such as EDTA, used in water treatment and food preservation.
Modern chemical plants still use the Andrussow Process today, largely unchanged in principle from his 1930 patents, though with modernized catalyst recovery systems.
6. Collaborations and Intellectual Network
- Walther Nernst: As a student of Nernst, Andrussow inherited a rigorous approach to thermodynamics. Nernst’s influence is visible in Andrussow's obsession with the precise physical constants of gases.
- IG Farben/BASF Research Teams: Andrussow worked alongside the engineers who scaled up the Haber-Bosch process. This environment of "high-pressure, high-temperature" chemistry was essential for his discovery of the HCN synthesis.
- The French Chemical Community: In his later years in Paris, he collaborated with French industrial researchers, helping to modernize the post-war European chemical infrastructure.
7. Lesser-Known Facts
- The Schliemann Connection: Leonid Andrussow was the grandson of Heinrich Schliemann, the famous (and controversial) amateur archaeologist who discovered the site of ancient Troy. His mother, Nadezhda Schliemann, was Heinrich’s daughter from his first marriage in Russia.
- A Multi-Cultural Scientist: Andrussow was a true polyglot and "European" citizen before the term was common. He was fluent in Russian, German, and French, and his career successfully spanned the three most powerful scientific cultures of his era.
- Longevity in Research: Unlike many scientists who move into administration, Andrussow remained a "working chemist" well into his 80s, continuing to publish updates on gas viscosity and thermal conductivity data until shortly before his death.