iGCSE: Contact Process to manufacture Sulphuric acid

Let's learn how to manufacture Sulphuric acid using contact process and ace the exams
Rating: 1.0 out of 5 (1 rating)
269 students
iGCSE: Contact Process to manufacture Sulphuric acid
Rating: 1.0 out of 5 (1 rating)
269 students
Deeper understanding of the Contact Process which is used to make Sulphuric Acid (H2SO4)– an important industrial chemical used to make paint, explosives, fertilisers, detergents and to bleach newsprint.


  • Basics of industrial manufacture of chemicals


The contact process is the current method of producing sulfuric acid in the high concentrations needed for industrial processes. Platinum was initially used as the catalyst for this reaction; however, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, vanadium(V) oxide (V2O5) is now preferred.

The process can be divided into five stages:

  1. Combining of sulfur and oxygen (O2) to form sulfur dioxide

  2. Purifying the sulfur dioxide in a purification unit

  3. Adding an excess of oxygen to sulfur dioxide in the presence of the catalyst vanadium pentoxide at 450 °C and 1-2 atm

  4. The sulfur trioxide formed is added to sulfuric acid which gives rise to oleum (disulfuric acid)

  5. The oleum is then added to water to form sulfuric acid which is very concentrated.

  6. As this process is an exothermic reaction so the temperature should be as low as possible. The yield has been found to be maximum at about 410 - 450° C.

Who this course is for:

  • Science students

Course content

1 section • 11 lectures • 46m total length
  • Welcome to the course!
  • Pre-read material
  • Instructor led session #1
  • Instructor led session #2
  • Instructor led session #3
  • Instructor led session #4
  • Instructor led session #5
  • Instructor led session #6
  • Revision: Step 1
  • Revision: Step 2
  • Revision: Step 3


Senior Science Professor
Rashmi Ramsinghaney
  • 1.0 Instructor Rating
  • 1 Review
  • 269 Students
  • 1 Course

Rashmi Ramsinghaney

Senior Chemistry Professor | Department of Science


30+ years of teaching experience across national and international education boards

Currently a senior Chemistry professor at DPS International

Participated in IGCSE workshops, seminars and teacher training programs conducted by CIE, UK


Post Graduate in Chemistry with specialization in Organic Chemistry

Additional details

Rashmi is known for mentoring students to pursue higher studies in the US and UK. She has a broad exposure to international and national curriculums and has taken her students on field trips to NASA, Harvard Business School and others. Rashmi holds the additional responsibility of leading inter school competitions in Delhi, India and manages NIE effort.