New Innovation Rubber Made from Sugarcane Lower CO2 Footprint

The Chemical engineers at Arlanxeo, one of the world’s largest producer of synthetic rubber in the Dutch city of Geleen have proven that the plant-based rubber production based on sugar cane has a much lower CO2 footprint than that of petroleum-based rubber. They revealed that the footprint is 85 percent lower than that of comparable conventional synthetic rubbers that percentage has been determined by examining the entire production process, from sowing the sugar cane in the ground to the finished product called Keltan Eco.

A researcher from ARLANXEO

Herman Dikland, a chemical engineer and head of innovation at Arlanxeo said “It’s not the case that this rubber is biodegradable. Try to imagine if a rubber car tire was biodegradable, then it would crumble under certain circumstances. Whereas the tire has to last a long time. When we talk about sustainable rubber, we are talking, for example, about synthetic rubber such as EPDM (ethylene propylene diene monomer rubber), whose main raw material, ethylene, is not extracted from naphtha (a product processed from crude oil) but rather from bioethanol.”

This bioethanol is produced from sugar cane that is grown on vast fields in Brazil, the largest sugar producing country in the world. Ethylene is made out of that bioethanol. Once the sugar cane has been harvested to make bioethanol, it simply grows again. “In this sense, it is a renewable resource that can regrow within a few months. Whereas fossil fuels take millions of years to develop.” He said.

At the moment, it is not possible to recycle used rubber at a competitive price, Dikland notes. “You cannot melt or dissolve rubber. This means you can create fantastic technological products that can withstand high temperatures. But it is precisely these properties that make them difficult to recycle back into their original raw materials.” This is still too expensive. But that could change in the future. “You can see right throughout the industry’s value chain that rubber processors want to do just that. If at some point, customers start asking for these products, the industry will start innovating in order to supply them.”

In contrast to polymers, not much research has yet been undertaken into making rubber recyclable, confirms Niels van der Aar, chemical engineer and project manager Sustainability at Arlanxeo. The composition of polymer products is purer than that of rubber products. When it comes to plastic, often more than 99 percent of the same raw material is used. Whereas with rubber, this is often less than half. That makes it more difficult to recycle.

Consequently, it is still difficult to recycle rubber and offer it as a product at an attractive price. But that is not impossible, according to Dikland. “In the Netherlands, a few million car tires are crushed for recycling each year. The grains are used, for example, to make floors for playgrounds. They can also be integrated into the bitumen that is used to make freeways. And they are used to extract dye for black ink.”

No matter how sustainable we may become as a world, Dikland and Van der Aar both expect that the demand for rubber to remain. We will just be more economical with it. Rubber is a raw material that you don’t usually see. But it is necessary in battery production for separating rechargeable cells. “It’s in your car around windows, in the engine, on your shower head to prevent water from leaking.”

There will be more sustainable rubber on the market in ten to fifteen years’ time, Dikland expects, because then there will probably be far more demand for it. This means more research will have been done into adapting the raw materials than is currently the case. On one point, however, a lot of environmental gains can quickly be realized. Namely, by making all EPDM rubber out of ethylene based on bioethanol. This is more likely to happen if there is a tax on CO2 emissions for the manufacture of it. This can be done as far as capacity is concerned,” says Van der Aar.

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