How to make coconut oil soap

Posted on 3 Aug 2018 by Maddy White

With natural products becoming increasingly popular in the health and well-being market, The Manufacturer learns how to make coconut oil-based soap.

Beauty brand, Lucy Bee, founded by entrepreneur Lucy Buckingham, has teamed up with Leeds-based soap manufacturer Stephenson Group, to produce its first range of coconut oil-based soaps; but how exactly are they made?

Stephenson Group, which has its global manufacturing plant in Horsforth, was the first manufacturer to successfully use 100% coconut oil in any soap formulation, and the company will be producing the Lucy Bee soaps set for market in the UK this October.

The natural products market in the UK is growing; The 2018 Organic Market Report published earlier this year by the Soil Association, shows that sales of organic and natural personal care products grew by an impressive 24% last year, totalling £75.9m, with the entire sales for the organic and natural market climbing to £2.2bn.

Sourcing and extracting coconut oil 

Lucy Bee’s coconut oil is an edible oil extracted from the kernel or meat of matured coconuts – known as the copra – and this is harvested from the coconut palm.

Coconut oil is an edible oil extracted from the kernel or meat of matured coconuts - image courtesy of Depositphotos.
The oil used by Lucy Bee coconut products is sourced from either the Philippines or Sri-Lanka – image courtesy of Depositphotos.

The oil is extracted within one to four hours of the coconut being cracked and to do this, coconuts are shelled and pared to remove the outer shell.

Coconut oil used by Lucy Bee is sourced from either the Philippines or Sri-Lanka.

The raw coconut kernel, is then ground or milled into fine granules and dried under controlled temperatures. Drying time in the Philippines takes an average of two and a half hours.

After drying, the kernel passes through a cold process expeller where the oil is extracted from the white meat, at a controlled temperature of 104 – 113°F.

The by-product of this process is either further processed and used as flour, or bagged for animal feed. The oil is then collected and filtered to remove any sediment.

The manufacturing process of coconut oil-based soap

James Clews, marketing manager for Stephenson Group, explained that manufacturing soap from coconut oils is more challenging than conventional palm oil or other materials, he said: “It requires different processing, you need to be much more careful because coconut oil is much more reactive.”

Coconut oil is an edible oil extracted from the kernel or meat of matured coconuts – image courtesy of Lucy Bee.

When soap is made, an oil or fatty acid is taken and this is reacted with alkaline, sodium hydroxide. These two ingredients are mixed together in a reactor and this produces soap and water, the water is then dried off leaving the soap.

Clews explained that during this process a lot of heat is released, and this results in the reaction bubbling and increasing in volume, he said: “You can go from six to eight tonnes of product in the reactor, that can then proceed to fill the space of 16 tonnes at the flick of a switch, because it suddenly starts reacting.”

The manufacturing process in six steps

  • Coconut oil is combined with alkaline sodium hydroxide in a reactor
  • Reaction releases high temperatures
  • Temperature is monitored as well as volume expansion of product
  • Reaction cools and leaves water and soap
  • Water is dried off leaving soap
  • Fragrance is added to the soap and it is packaged

Clews said: “You have to be really careful to control the reaction, otherwise the reactor can overflow which means the product could get ruined and burn.” 

James Clews and Lucy Buckingham at Stephenson Group’s manufacturing plant – image courtesy of Stephenson Group.

Clews explained regulating temperature and volume is vital for safety and the product’s quality, he said: “We temperature control the heating system that sits around the reaction vessel with steam, we also have a calibrated load cell so we know the exact weight of the products; we also measure the volume of product constantly – so it is largely temperature and volume control.”

He said the soap needs to go through rigorous stability tests to make sure the product is completely safe for consumers. The soap needs to be tested twice for 13 weeks; once after the product is made, and then again after fragrance is added.

Clews concluded: “It is a complex process, when you are making something natural you have to do lots of stability work, to make sure what you have created is stable.”