GHG and Energy
Based upon our Climate Change Policy, the Mitsui Chemicals Group is committed to reducing GHG emissions and energy consumption, particularly aiming at low-carbon manufacturing.
*See here for other information concerning climate change.
GHG Emissions and Energy Consumption
In fiscal 2016, the Mitsui Chemicals Group set itself the long-term target of reducing domestic greenhouse gas (GHG) emissions by 25.4% by fiscal 2030 (compared with fiscal 2005, operating at full capacity). To this end, we are working to realize a low-carbon society by actively promoting energy conservation, switching to alternative fuels, and creating innovative processes.
In fiscal 2018, we set the goal of reducing GHG emissions by over 150,000 tons (compared with fiscal 2017; operating at full capacity), and we achieved a reduction of 183,000 tons. We achieved this by comprehensively reducing factory energy use, including enhancing exhaust heat recovery, improving the efficiency of our refining processes and reducing NF3 (nitrogen trifluoride) emissions. As a result, our GHG emissions reduction rate (operating at full capacity) reached 27.2% compared with fiscal 2005.
GHG Emissions Reduction Rate (compared with fiscal 2005, operating at full capacity) (Japan)
*Scope of affiliates: Domestic consolidated subsidiaries
The Mitsui Chemicals Group reduced GHG emissions (Scope 1 and 2) in fiscal 2018 by 360,000 tons compared with fiscal 2017. The Group adopted a five-year annual energy intensity reduction rate of 1% or more as its target under the 2025 Long-term Business Plan; however, the result for fiscal 2018 was –0.3%. Looking ahead, while targeting a five-year rate of at least 1%, since fiscal 2018 we have aimed to either achieve a five-year annual reduction rate of at least 1% or an average annual reduction in the energy intensity index (FY2009 = 100) of at least 1%. This is because of the difficulties involved in evaluating long-term reduction efforts based on a five-year annual reduction rate.
In addition, we calculate GHG emissions regarding Scope 1 and 2 emissions generated from in-house operations and production activities as well as Scope 3 for indirect emissions in order to identify GHG emissions throughout the entire supply chain, extending from purchasing raw materials to customer use and disposal.
GHG Emissions (Scope 1 and 2)
* Scope of Japan and overseas affiliates: Consolidated subsidiaries
*GHG emissions calculated in accordance with Japan’s Law Concerning the Promotion of Measures to Cope with Global Warming based on energy consumption figures for overseas consolidated subsidiaries.
*The gases used to calculate GHG emissions are CO2, CH4, N2O, HFC, PFC, SF6, NF3.
*We previously disclosed our GHG emissions as a combination of both Scope 1 and Scope 2 less the amount of electricity and steam sold, but we now disclose the sum of Scope 1 and Scope 2.
Energy Intensity (Mitsui Chemicals, Inc.)
*Energy intensity denominator is ethylene conversion production volume.
*Retroactive changes were made on energy intensity due to revisions to energy intensity denominators (the conversion factor for production volume) for some products.
GHG Emissions (Scope 3) (Mitsui Chemicals, Inc.)
Breakdown of GHG Emissions (Scope 3) (Mitsui Chemicals, Inc. Fiscal 2017)
CO2eq / year)
|01：Purchased goods and services||3,765|
|03：Fuel- and energy-related activities (not included in Scope 1 and 2)||197|
|05：Waste generated from operations||38|
|08：Leased assets (upstream)||1|
|11：Sold product specifications||3,638|
|12：Sold product disposals||2,253|
Basic Guidelines for Calculating Greenhouse Gas Emissions Via Supply Chains (Ver. 2.3), Ministry of the Environment and Ministry of Economy, Trade and Industry
Based on the Basic Guidelines for Calculating Greenhouse Gas Emissions Via Supply Chains (Ver. 2.4) published by the Ministry of the Environment and Ministry of Economy, Trade and Industry, we used emission factors provided by IDEA and the Act on Promotion of Global Warming Countermeasures calculation/reporting/disclosure system, and emission units formulated by the Ministry of Environment.
Energy-Saving Process Using LNG Cold Energy
Together with Osaka Gas Co., Ltd., Mitsui Chemicals and its group company, Osaka Petrochemical Industries, Ltd. have adopted energy-saving process by using liquefied natural gas (LNG)-generated cold energy in the ethylene plant. This world-first energy-saving process using LNG-generated cold energy on a large-scale at our ethylene plant commenced in October 2010.
To transport and store natural gas, it is liquefied by cooling it to -160°C. Liquefied gas is a good source of cold energy. During its liquefied state, LNG emits boil off gas which has auto-refrigeration properties. When returning LNG to its gas state, it continues to retain superior cooling abilities.
At Mitsui Chemicals’ Osaka Works OPC ethylene plant, after thermal decomposition of naphtha (crude gasoline) at high temperatures, base materials such as ethylene and propylene are separated and purified by cooling the cracked gas. By efficient use of LNG cold energy from the adjacent OPC ethylene plant of Osaka Gas Senboku Works, a significant reduction in CO2 emissions was possible.
CCU（Carbon Capture Usage）Technologies
Mitsui Chemicals took part in the CCU Project (CO2 + H2 ⇒CH3OH +H2O) lead by the Research Institute of Innovative Technology for the Earth (RITE) (commissioned by NEDO), and developed a high activity catalyst. Refinement of this highly active catalyst eventually was tested by the pilot plant of CCU technology in Mitsui Chemicals Osaka Works in 2009. This was a verification test, producing 100 tons of methanol per year from hydrogen and CO2 which was contained in the exhaust gases. We have confirmed the conversion ratio from CO2 to methanol and the catalyst life and obtained necessary data items for creating a technological package. However, due to several issues that remained to be addressed concerning costs and availability of hydrogen source, this technology has not yet been commercialized. Nevertheless, we believe that this promising technology should greatly contribute to the realization of low-carbon society which is currently sought by the world.